Abstract: The fault activities in Beijing region show a changing feature by stages. For instance, there obviously appeared two turns in mode of fault movements for the study region in 1973 and 1976 respectively. The first one caused a substantial change of regional stress pattern, while the second did not do so. It is suggested that this faulting feature by stages is generated due to development and occurrence of the 1976 Tang-shan earthquake(M=7.8).