diff --git a/backend/app.py b/backend/app.py
new file mode 100644
index 0000000..ee620fa
--- /dev/null
+++ b/backend/app.py
@@ -0,0 +1,166 @@
+from flask import Flask, request, jsonify
+import psycopg2
+from contextlib import contextmanager
+
+app = Flask(__name__)
+
+@contextmanager  
+def get_db_connection():
+    conn = psycopg2.connect(
+        host="localhost",
+        database="tkmp_db", 
+        user="tkmp_user",
+        password="tkmp2024!",
+        port="5432"
+    )
+    try:
+        yield conn
+    finally:
+        conn.close()
+
+@app.route('/')
+def home():
+    return {"message": "API 작동 중"}
+
+@app.route('/api/materials')
+def get_materials():
+    job_number = request.args.get('job_number')
+    
+    if not job_number:
+        return {"error": "job_number 필요"}, 400
+    
+    try:
+        with get_db_connection() as conn:
+            cur = conn.cursor()
+            
+            cur.execute("""
+                SELECT id, job_number, item_number, description, 
+                       category, quantity, unit, created_at
+                FROM materials 
+                WHERE job_number = %s
+                ORDER BY item_number
+            """, (job_number,))
+            
+            rows = cur.fetchall()
+            
+            materials = []
+            for r in rows:
+                item = {
+                    'id': r[0],
+                    'job_number': r[1], 
+                    'item_number': r[2],
+                    'description': r[3],
+                    'category': r[4],
+                    'quantity': r[5],
+                    'unit': r[6],
+                    'created_at': str(r[7]) if r[7] else None
+                }
+                materials.append(item)
+            
+            return {
+                'success': True,
+                'data': materials,
+                'count': len(materials)
+            }
+            
+    except Exception as e:
+        return {"error": f"DB 오류: {str(e)}"}, 500
+
+if __name__ == '__main__':
+    print("🚀 서버 시작: http://localhost:5000")
+    app.run(debug=True, port=5000)
+# 수정된 get_materials API (올바른 컬럼명 사용)
+@app.route('/api/materials-fixed', methods=['GET'])
+def get_materials_fixed():
+    """올바른 컬럼명을 사용한 자재 조회 API"""
+    try:
+        file_id = request.args.get('file_id')
+        
+        if not file_id:
+            return jsonify({
+                'success': False,
+                'error': 'file_id parameter is required'
+            }), 400
+        
+        with get_db_connection() as conn:
+            cur = conn.cursor()
+            
+            cur.execute("""
+                SELECT 
+                    id, file_id, line_number, original_description, 
+                    classified_category, classified_subcategory,
+                    quantity, unit, created_at
+                FROM materials 
+                WHERE file_id = %s
+                ORDER BY line_number
+            """, (file_id,))
+            
+            materials = []
+            for item in cur.fetchall():
+                material = {
+                    'id': item[0],
+                    'file_id': item[1],
+                    'line_number': item[2],
+                    'original_description': item[3],
+                    'classified_category': item[4],
+                    'classified_subcategory': item[5],
+                    'quantity': float(item[6]) if item[6] else 0,
+                    'unit': item[7],
+                    'created_at': item[8].isoformat() if item[8] else None
+                }
+                materials.append(material)
+            
+            return jsonify({
+                'success': True,
+                'data': materials,
+                'count': len(materials),
+                'file_id': file_id
+            })
+            
+    except Exception as e:
+        print(f"Error in get_materials_fixed: {e}")
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+@app.get("/api/materials-test")
+def get_materials_test(file_id: int):
+    """테스트용 자재 조회 API"""
+    try:
+        with get_db_connection() as conn:
+            cur = conn.cursor()
+            
+            cur.execute("""
+                SELECT 
+                    id, file_id, line_number, original_description, 
+                    classified_category, quantity, unit
+                FROM materials 
+                WHERE file_id = %s
+                ORDER BY line_number
+                LIMIT 5
+            """, (file_id,))
+            
+            rows = cur.fetchall()
+            
+            materials = []
+            for r in rows:
+                materials.append({
+                    'id': r[0],
+                    'file_id': r[1],
+                    'line_number': r[2],
+                    'description': r[3],
+                    'category': r[4],
+                    'quantity': float(r[5]) if r[5] else 0,
+                    'unit': r[6]
+                })
+            
+            return {
+                'success': True,
+                'data': materials,
+                'count': len(materials)
+            }
+            
+    except Exception as e:
+        return {'error': str(e)}
+
diff --git a/backend/app/routers/files.py b/backend/app/routers/files.py
index 8cbd861..4d9bfc1 100644
--- a/backend/app/routers/files.py
+++ b/backend/app/routers/files.py
@@ -299,22 +299,22 @@ async def get_materials(
             "limit": limit,
             "materials": [
                 {
-                    "id": m.id,
-                    "file_id": m.file_id,
-                    "filename": m.original_filename,
-                    "job_no": row.job_no,
-                    "project_code": row.job_no,
-                    "project_name": "Job-" + str(f.job_no) if f.job_no else "Unknown",
-                    "original_description": row.original_description,
-                    "quantity": float(m.quantity) if m.quantity else 0,
-                    "unit": m.unit,
-                    "classified_category": row.classified_category,
-                    "classification_confidence": float(row.classification_confidence) if m.classification_confidence else 0.0,
-                    "size_spec": m.size_spec,
-                    "material_grade": m.material_grade,
-                    "line_number": m.line_number,
-                    "row_number": m.row_number,
-                    "created_at": m.created_at
+                    "id": m[0],
+                    "file_id": m[1],
+                    "filename": m[10],
+                    "job_no": m[12],
+                    "project_code": m[12],
+                    "project_name": "Job-" + str(m[11]) if m[11] else "Unknown",
+                    "original_description": m[2],
+                    "quantity": float(m[3]) if m.quantity else 0,
+                    "unit": m[4],
+                    "classified_category": m[14],
+                    "classification_confidence": float(m[15]) if m.classification_confidence else 0.0,
+                    "size_spec": m[5],
+                    "material_grade": m[6],
+                    "line_number": m[7],
+                    "row_number": m[8],
+                    "created_at": m[9]
                 }
                 for m in materials
             ]