IN THE HISTORIC CENTER IN XIAN CITY, THE SCENE IN THE GROUPS OF TRADITIONAL HOUSES HAS CHANGED RAPIDLY, AND THE LIVING ENVIRONMENT HAS GROWN WORSE. TO IMPROVE THE LIVING ENVIRONMENT, A CONSTRUCTION OF HOUSING CORPORATION TERRASE HAS BEEN CARRIED OUT. BUT THIS CONSTRUCTION HAS DESTROIED THE SCENE IN THE GROUPS OF TRADITIONAL HOUSES EXTREMELY. THIS STUDY IS TO RESEARCH THE SCHEME THAT CAN BE COMPATIBLE WITH TWO CONTRADICTORY SUBJEC -THE PRESERVATION OF HISTORICAL TOWNSCAPE AND THE INPROVEMENT OF THE LIVING ENVIRONMENT.