Abstract: Science and technology have become the main factor of social development,and the technical representation has also become the primary means of architectural creation.But the practice of the old building renevation is different from that of a new construction,which is an organic integration result of old and new systems.This endows the technology selection and technology application of old buildings with its own characteristics.This article tries to analyze the technical self-value and logical characteristics in the renovation of old buildings,summarizes the means of technology application,which would be useful for the practice of old building renovation.