diff --git a/src/landppt/database/models.py b/src/landppt/database/models.py
new file mode 100644
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+++ b/src/landppt/database/models.py
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+"""
+SQLAlchemy database models for LandPPT
+"""
+
+import time
+import hashlib
+from typing import Dict, Any, List, Optional
+from sqlalchemy import Column, Integer, String, Text, Float, Boolean, ForeignKey, JSON, DateTime
+from sqlalchemy.orm import relationship, Mapped, mapped_column
+from sqlalchemy.ext.declarative import declarative_base
+from datetime import datetime
+
+Base = declarative_base()
+
+
+class User(Base):
+    """User model for authentication"""
+    __tablename__ = "users"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    username: Mapped[str] = mapped_column(String(50), unique=True, index=True, nullable=False)
+    password_hash: Mapped[str] = mapped_column(String(128), nullable=False)
+    email: Mapped[Optional[str]] = mapped_column(String(100), unique=True, index=True, nullable=True)
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
+    is_admin: Mapped[bool] = mapped_column(Boolean, default=False)
+    created_at: Mapped[float] = mapped_column(Float, default=time.time)
+    last_login: Mapped[Optional[float]] = mapped_column(Float, nullable=True)
+
+    def set_password(self, password: str):
+        """Set password hash"""
+        self.password_hash = hashlib.sha256(password.encode()).hexdigest()
+
+    def check_password(self, password: str) -> bool:
+        """Check if password is correct"""
+        return self.password_hash == hashlib.sha256(password.encode()).hexdigest()
+
+    def to_dict(self) -> Dict[str, Any]:
+        """Convert to dictionary"""
+        return {
+            "id": self.id,
+            "username": self.username,
+            "email": self.email,
+            "is_active": self.is_active,
+            "is_admin": self.is_admin,
+            "created_at": self.created_at,
+            "last_login": self.last_login
+        }
+
+
+class UserSession(Base):
+    """User session model"""
+    __tablename__ = "user_sessions"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    session_id: Mapped[str] = mapped_column(String(128), unique=True, index=True, nullable=False)
+    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at: Mapped[float] = mapped_column(Float, default=time.time)
+    expires_at: Mapped[float] = mapped_column(Float, nullable=False)
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
+
+    # Relationship
+    user: Mapped["User"] = relationship("User")
+
+    def is_expired(self) -> bool:
+        """Check if session is expired"""
+        # If expires_at is set to year 2099 or later, consider it as never expires
+        year_2099_timestamp = time.mktime(time.strptime("2099-01-01 00:00:00", "%Y-%m-%d %H:%M:%S"))
+        if self.expires_at >= year_2099_timestamp:
+            return False
+        return time.time() > self.expires_at
+
+
+class Project(Base):
+    """Project model for storing PPT projects"""
+    __tablename__ = "projects"
+    
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    project_id: Mapped[str] = mapped_column(String(36), unique=True, index=True)
+    title: Mapped[str] = mapped_column(String(255), nullable=False)
+    scenario: Mapped[str] = mapped_column(String(100), nullable=False)
+    topic: Mapped[str] = mapped_column(String(255), nullable=False)
+    requirements: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+    status: Mapped[str] = mapped_column(String(50), default="draft")
+    outline: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSON, nullable=True)
+    slides_html: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+    slides_data: Mapped[Optional[List[Dict[str, Any]]]] = mapped_column(JSON, nullable=True)
+    confirmed_requirements: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSON, nullable=True)
+    project_metadata: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSON, nullable=True)  # 项目元数据，包括选择的模板ID等
+    version: Mapped[int] = mapped_column(Integer, default=1)
+    share_token: Mapped[Optional[str]] = mapped_column(String(64), unique=True, index=True, nullable=True)  # 分享token，用于公开访问
+    share_enabled: Mapped[bool] = mapped_column(Boolean, default=False)  # 是否启用分享
+    created_at: Mapped[float] = mapped_column(Float, default=time.time)
+    updated_at: Mapped[float] = mapped_column(Float, default=time.time, onupdate=time.time)
+    
+    # Relationships
+    todo_board: Mapped[Optional["TodoBoard"]] = relationship("TodoBoard", back_populates="project", uselist=False)
+    versions: Mapped[List["ProjectVersion"]] = relationship("ProjectVersion", back_populates="project")
+    slides: Mapped[List["SlideData"]] = relationship("SlideData", back_populates="project")
+    speech_scripts: Mapped[List["SpeechScript"]] = relationship("SpeechScript", back_populates="project")
+
+
+class TodoBoard(Base):
+    """TODO Board model for project workflow management"""
+    __tablename__ = "todo_boards"
+    
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    project_id: Mapped[str] = mapped_column(String(36), ForeignKey("projects.project_id"), unique=True)
+    current_stage_index: Mapped[int] = mapped_column(Integer, default=0)
+    overall_progress: Mapped[float] = mapped_column(Float, default=0.0)
+    created_at: Mapped[float] = mapped_column(Float, default=time.time)
+    updated_at: Mapped[float] = mapped_column(Float, default=time.time, onupdate=time.time)
+    
+    # Relationships
+    project: Mapped["Project"] = relationship("Project", back_populates="todo_board")
+    stages: Mapped[List["TodoStage"]] = relationship("TodoStage", back_populates="todo_board", order_by="TodoStage.stage_index")
+
+
+class TodoStage(Base):
+    """TODO Stage model for individual workflow stages"""
+    __tablename__ = "todo_stages"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    todo_board_id: Mapped[int] = mapped_column(Integer, ForeignKey("todo_boards.id"))
+    project_id: Mapped[str] = mapped_column(String(36), ForeignKey("projects.project_id"), index=True)  # Added for direct project reference
+    stage_id: Mapped[str] = mapped_column(String(100), nullable=False, index=True)  # Added index for better performance
+    stage_index: Mapped[int] = mapped_column(Integer, nullable=False)
+    title: Mapped[str] = mapped_column(String(255), nullable=False)
+    description: Mapped[str] = mapped_column(Text, nullable=False)
+    status: Mapped[str] = mapped_column(String(50), default="pending", index=True)  # Added index for status queries
+    progress: Mapped[float] = mapped_column(Float, default=0.0)
+    result: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSON, nullable=True)
+    created_at: Mapped[float] = mapped_column(Float, default=time.time)
+    updated_at: Mapped[float] = mapped_column(Float, default=time.time, onupdate=time.time)
+
+    # Relationships
+    todo_board: Mapped["TodoBoard"] = relationship("TodoBoard", back_populates="stages")
+    project: Mapped["Project"] = relationship("Project", foreign_keys=[project_id])  # Direct project relationship
+
+
+class ProjectVersion(Base):
+    """Project version model for version control"""
+    __tablename__ = "project_versions"
+    
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    project_id: Mapped[str] = mapped_column(String(36), ForeignKey("projects.project_id"))
+    version: Mapped[int] = mapped_column(Integer, nullable=False)
+    timestamp: Mapped[float] = mapped_column(Float, default=time.time)
+    data: Mapped[Dict[str, Any]] = mapped_column(JSON, nullable=False)
+    description: Mapped[str] = mapped_column(String(500), nullable=False)
+    
+    # Relationships
+    project: Mapped["Project"] = relationship("Project", back_populates="versions")
+
+
+class SlideData(Base):
+    """Slide data model for individual PPT slides"""
+    __tablename__ = "slide_data"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    project_id: Mapped[str] = mapped_column(String(36), ForeignKey("projects.project_id"))
+    slide_index: Mapped[int] = mapped_column(Integer, nullable=False)
+    slide_id: Mapped[str] = mapped_column(String(100), nullable=False)
+    title: Mapped[str] = mapped_column(String(255), nullable=False)
+    content_type: Mapped[str] = mapped_column(String(50), nullable=False)
+    html_content: Mapped[str] = mapped_column(Text, nullable=False)
+    slide_metadata: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSON, nullable=True)
+    template_id: Mapped[Optional[int]] = mapped_column(Integer, ForeignKey("ppt_templates.id"), nullable=True)
+    is_user_edited: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
+    created_at: Mapped[float] = mapped_column(Float, default=time.time)
+    updated_at: Mapped[float] = mapped_column(Float, default=time.time, onupdate=time.time)
+
+    # Relationships
+    project: Mapped["Project"] = relationship("Project", back_populates="slides")
+    template: Mapped[Optional["PPTTemplate"]] = relationship("PPTTemplate", back_populates="slides")
+
+
+class PPTTemplate(Base):
+    """PPT Template model for storing master templates"""
+    __tablename__ = "ppt_templates"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    project_id: Mapped[str] = mapped_column(String(36), ForeignKey("projects.project_id"))
+    template_type: Mapped[str] = mapped_column(String(50), nullable=False, index=True)  # title, content, chart, image, summary
+    template_name: Mapped[str] = mapped_column(String(255), nullable=False)
+    description: Mapped[str] = mapped_column(Text, nullable=True)
+    html_template: Mapped[str] = mapped_column(Text, nullable=False)
+    applicable_scenarios: Mapped[List[str]] = mapped_column(JSON, nullable=True)  # 适用场景
+    style_config: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSON, nullable=True)  # 样式配置
+    usage_count: Mapped[int] = mapped_column(Integer, default=0)  # 使用次数统计
+    created_at: Mapped[float] = mapped_column(Float, default=time.time)
+    updated_at: Mapped[float] = mapped_column(Float, default=time.time, onupdate=time.time)
+
+    # Relationships
+    project: Mapped["Project"] = relationship("Project", foreign_keys=[project_id])
+    slides: Mapped[List["SlideData"]] = relationship("SlideData", back_populates="template")
+
+
+class GlobalMasterTemplate(Base):
+    """Global Master Template model for storing reusable master templates"""
+    __tablename__ = "global_master_templates"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    template_name: Mapped[str] = mapped_column(String(255), nullable=False, unique=True)
+    description: Mapped[str] = mapped_column(Text, nullable=True)
+    html_template: Mapped[str] = mapped_column(Text, nullable=False)
+    preview_image: Mapped[Optional[str]] = mapped_column(Text, nullable=True)  # Base64 encoded preview image
+    style_config: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSON, nullable=True)  # 样式配置
+    tags: Mapped[List[str]] = mapped_column(JSON, nullable=True)  # 标签分类
+    is_default: Mapped[bool] = mapped_column(Boolean, default=False)  # 是否为默认模板
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True)  # 是否启用
+    usage_count: Mapped[int] = mapped_column(Integer, default=0)  # 使用次数统计
+    created_by: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)  # 创建者
+    created_at: Mapped[float] = mapped_column(Float, default=time.time)
+    updated_at: Mapped[float] = mapped_column(Float, default=time.time, onupdate=time.time)
+
+
+class SpeechScript(Base):
+    """演讲稿存储表"""
+    __tablename__ = "speech_scripts"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
+    project_id: Mapped[str] = mapped_column(String(36), ForeignKey("projects.project_id"), nullable=False, index=True)
+    slide_index: Mapped[int] = mapped_column(Integer, nullable=False)
+    slide_title: Mapped[str] = mapped_column(String(255), nullable=False)
+    script_content: Mapped[str] = mapped_column(Text, nullable=False)
+    estimated_duration: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
+    speaker_notes: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+
+    # 生成参数
+    generation_type: Mapped[str] = mapped_column(String(20), nullable=False)  # single, multi, full
+    tone: Mapped[str] = mapped_column(String(50), nullable=False)
+    target_audience: Mapped[str] = mapped_column(String(100), nullable=False)
+    custom_audience: Mapped[Optional[str]] = mapped_column(Text, nullable=True)  # 自定义受众描述
+    language_complexity: Mapped[str] = mapped_column(String(20), nullable=False)
+    speaking_pace: Mapped[str] = mapped_column(String(20), nullable=False)
+    custom_style_prompt: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
+    include_transitions: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
+    include_timing_notes: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
+
+    # 时间戳
+    created_at: Mapped[float] = mapped_column(Float, default=time.time, nullable=False)
+    updated_at: Mapped[float] = mapped_column(Float, default=time.time, onupdate=time.time, nullable=False)
+
+    # 关联关系
+    project: Mapped["Project"] = relationship("Project", back_populates="speech_scripts")
+
+    def __repr__(self):
+        return f"<SpeechScript(id={self.id}, project_id='{self.project_id}', slide_index={self.slide_index})>"