diff --git a/backend/app/main.py b/backend/app/main.py
index b3ffb6e..a7071d1 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -1,10 +1,20 @@
-from fastapi import FastAPI
+
+from fastapi import FastAPI, Depends, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
+from sqlalchemy.orm import Session
+from sqlalchemy import text
+from typing import List
+
+from . import models, schemas
+from .database import SessionLocal, engine, get_db
+
+# 데이터베이스 테이블 생성 (이미 존재하면 무시)
+models.Base.metadata.create_all(bind=engine)
 
 app = FastAPI(
     title="TK-MP BOM System API",
-    description="BOM (Bill of Materials) 시스템 API",
-    version="1.0.0"
+    description="BOM (Bill of Materials) 시스템 API - 실제 데이터베이스 연동",
+    version="2.0.0"
 )
 
 # CORS 설정
@@ -20,21 +30,58 @@ app.add_middleware(
 async def root():
     return {
         "message": "TK-MP BOM System API", 
-        "version": "1.0.0",
-        "status": "running"
+        "version": "2.0.0",
+        "status": "running",
+        "database": "PostgreSQL 연결됨"
     }
 
 @app.get("/health")
-async def health_check():
-    return {
-        "status": "healthy", 
-        "database": "connected",
-        "api": "operational"
-    }
+async def health_check(db: Session = Depends(get_db)):
+    try:
+        # 데이터베이스 연결 테스트 (SQLAlchemy 2.0 문법)
+        result = db.execute(text("SELECT 1"))
+        return {
+            "status": "healthy", 
+            "database": "connected",
+            "api": "operational",
+            "version": "2.0.0",
+            "db_test": "SUCCESS"
+        }
+    except Exception as e:
+        return {
+            "status": "error",
+            "database": "disconnected", 
+            "error": str(e)
+        }
 
-@app.get("/api/projects")
-async def get_projects():
-    return {
-        "projects": [],
-        "message": "프로젝트 목록 (추후 데이터베이스 연결)"
-    }
+# 프로젝트 API
+@app.get("/api/projects", response_model=schemas.ProjectResponse)
+async def get_projects(db: Session = Depends(get_db)):
+    try:
+        projects = db.query(models.Project).all()
+        return {
+            "projects": projects,
+            "total": len(projects),
+            "message": f"총 {len(projects)}개 프로젝트 조회됨"
+        }
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"데이터베이스 오류: {str(e)}")
+
+@app.post("/api/projects", response_model=schemas.Project)
+async def create_project(project: schemas.ProjectCreate, db: Session = Depends(get_db)):
+    try:
+        db_project = models.Project(**project.dict())
+        db.add(db_project)
+        db.commit()
+        db.refresh(db_project)
+        return db_project
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=500, detail=f"프로젝트 생성 오류: {str(e)}")
+
+@app.get("/api/projects/{project_id}", response_model=schemas.Project)
+async def get_project(project_id: int, db: Session = Depends(get_db)):
+    project = db.query(models.Project).filter(models.Project.id == project_id).first()
+    if project is None:
+        raise HTTPException(status_code=404, detail="프로젝트를 찾을 수 없습니다")
+    return project