The time and spatial feature of the regional seismicity triggered by the Hyogo-Ken Nanbu, Japan, M=7.2 earthquakeon January 17,1995, was studied. The concerned region is about several hundred kilometers in length and breadthsurrounding the epicenter (33°~37°N, 133°~ 13 8°E). It is divided into 16 subregions. The seismicity of these subregionsfrom January of 1976 to June of 1996 has been analyzed. It is showed that, ① there were significant seismicity changesin 10 subregions triggered by the Hyogo-Ken Nanbu, Japan, M=7.2 earthquake on January 17, 1995. These changespassed a Z statistic test exceeding 0.95 confidence level and the greatest epicenter distance of these subregions was 280km; ② seismicity changes were triggered within 1~5 days in three subregions near the main shock while in othersubregions the seismicity changes were triggered within several ten days alter the main shock; ③ the greatest triggeredevent is 5.4, which is about the same size as the greatest aftershock; ④ the regional stress change resulted from the mainshock may be the triggered mechanism of the regional regional seismicity. The time and spatial feature of the regional seismicity triggered by the Hyogo-Ken Nanbu, Japan, M = 7.2 earthquakeon January 17, 1995, was studied. The concerned region is about several hundred kilometers in length and breadthsurrounding the epicenter (33 ° -37 The seismicity of these subregions has been analyzed from January of 1976 to June of 1996. It is showed that that ① there were significant seismicity changes in 10 subregions triggered by the Hyogo-Ken Nanbu, Japan, M = 7.2 earthquake on January 17, 1995. These changes passsed a Z statistic test exceeding 0.95 confidence level and the greatest epicenter distance of these subregions was 280km; ② seismicity changes were triggered within 1 ~ 5 days in three subregions near the main shock while in othersubregions the seismicity changes were triggered within several ten days alter the main shock; ③ the greatest triggeredevent is 5.4, which is about the same size as the greatest aftershock ; ④ the regional stress change diluted from the mainshock may be the triggered mechanism of the regional regional seismicity.