Abstract: An excellent historic building has been used for 80 years，there are damages and obvious structural aging， which need to be reinforced and renovated． The field testing and seismic qualification were done for the original building，whose results could basically meet the requirements of the current norms in China． Based on the actual situation that the original structural steel members were corroded，protection layer falled off and resistance to lateral force was insufficient ，it was developed a reinforcement design scheme，and proposed the measures of adding shearwall and reinforcing its base，sticking steel plate outside and affixing carbon fabric to reinforce the original steel beams and columns． Then checking was carried out for seismic analysis of the reinforced structure the settlement observation was done during construction，the reform effect was excellent．