In recent years, Chinese society is faced with a serious aging problem and the lack of pension resources. It is expected that, in 2020,the population of aged beyond 60 years old will reach 240 million, accounting for the total population was 17.71%.The group of the old are centralized distributed in old buildings of 1970s or 1980s,which are numerous nationwide. Housing in Chongqing is widely distributed in the main district in 1980s,and now, it has the stock of about 400 million square meters. Based on the surveys and researches on the life’s quality of the old people who live in the old buildings, and combined with the residential characteristics of 1970s or 1980s,we accomplished a modular-building program used to make old people’s life easier. The program includes 4 core modules-the transformation of performance, venues, comfort, safety, moreover, the program has the introduction of green building technology. Through the review literature and the energy simulation, it shows that the old buildings in terms of comfort, convenience degree and so on will have greatly improved after the transformation according to the program, and the maximum annual energy consumption and the annual total energy consumption will be decreased.