The project was originally set in shouchang, a thousand-year old town in zhejiang province. Old jiande people will never forget hengshan iron and steel plant in zhejiang province. It was founded in 1960, is the ministry of metallurgy only designated ferrochrome alloy production professional enterprises, the first batch of large state-owned enterprises and the state "double guarantee" enterprises, has made great contributions to China's military industry, iron and steel industry, foreign aid projects, international trade and local development. Reached its zenith in 2003, hengshan steel mills to officially declare bankruptcy, since 2013, in zhejiang province jiande grasp "three a" action to carry out the opportunity, will improve the condition of horizontal steel and revitalize the stock of assets combined with old factory work, to develop the thinking of construction of key management, transverse steel blocks, inject features small town life, old transverse steel coruscate gives new life from now on. The scope of project reconstruction and expansion is the canteen of hengshan iron and steel plant. As required by the overall planning, the reconstruction and expansion project shall be dismantled and kept in half. Architects in thinking about the early stage, to the design concept of the integration and symbiosis into came in, which would hold the original Chinese style building posture and the hanging roof forms, such as white walls, grey brick texture atmosphere, is interested in this new extension building posture and rendering atmosphere and its echo coordination, especially the top of the main entrance, use modern approximation of the hanging steel material qualitative make it form and its echo, which meet the characteristics of the integration of the old building with new elements present principle of symbiosis, the purpose is to keep the original construction environment, and the characteristics of the modelling, also in order to retain the original miss old building heart hearts. Architects continue the idea of "symbiosis", not just only consider the integration of the building itself, also make the "symbiosis" buildings and environment, in the construction of the east and south to use elements of large area glass, which increase the construction of modern Chinese also brought plenty of light, and can be in a more broad perspective to appreciate the rich park green landscape environment, and to show the natural appearance of green environmental protection; From the perspective of the overall plan of the site, the architect set the new main entrance on the east side of the road, and also took into account the problem of people and vehicles in the restaurant, changed the original part of the green space in the south of the building into parking lot and leisure square, to maximize the buffer space to meet the flow of people and cars. Due to the problems left over from history, the relevant files and materials of the reconstruction and expansion project are not complete enough. In order to achieve a better effect of the overall design, the architect has conducted on-site exploration for many times and communicated with relevant engineers, technicians, managers and leaders on site about the details. For the best results to present the "town living room" project laid a good foundation. Limited by many on-site conditions of the project, the designer tries to retain the original historical memory of the old building, which reflects the designer's humanistic care and historical responsibility.