该文用O—1序列统计分析及自相关分析方法讨论了我国及分区地震活动性。确定判决水平MD后可将地震序列转化为0—1序列。子序列Lk变化情况反映了大于某一级地震的重复特征。1897年—1983年我国地震序列在K=4、8、10时Lk为高值,序列的自相关函数ρ在τ=4时为0.38,置信水平α=0.01。对我国分区的地震序列进行了类似的分析。 This paper discusses the seismicity of China and its sub-region by O-1 series statistical analysis and autocorrelation analysis. Determine the level of decision MD after the earthquake sequence into 0-1 sequence. The variation of sub-series Lk reflects the repeated features larger than a certain level of earthquakes. From 1897 to 1983, Lk of earthquake sequence in China was high at K = 4, 8 and 10, and the autocorrelation function ρ of the sequence was 0.38 at τ = 4 and the confidence level α was 0.01. A similar analysis has been done on the seismic sequences in our country.