Abstract: In April 2022, general code GB 55021-2022 for assessment and rehabilitation of existing buildings was released. At present there are two methods of seismic checking of existing buildings, and three methods of the reduction of earthquake action, which can be combined for the 6 methods. The methods used in the seismic appraisal and the magnitude of the seismic action reduction coefficient are unstudied. In order to solve the calculation method problem of seismic appraisal, the characteristics of seismic checking and the basic principles of the reduction of earthquake action were summarized through the basic concept. The characteristics and deficiencies of the seismic action adjustment strategy were compared. The strategy for seismic action adjustment of seismic appraisal was proposed through the analysis of the reduction coefficient. In practice, the strategy for seismic action adjustment should be affirmed according to the economic effect and safety effect, using the suggestions of this paper.