Abstract:Based on the calculation results of b-value,Δb spatially scanning and multiple-seismicity-parameter-value combinations(b, √E, n,a/b),we comprehensively analyze the stress state of basins around the Ordos block and then determine their risks. The results show that annually seismicity rate and annually strain-release-rate generally decrease in the fault depression belt around the Ordos block,revealing the weak seismicity of this region since June,2010. The difference of b-value between 1970~2018 and 1970~2010 is not obvious. The areas that are worthy of attention,including Dengkou-Wuyuan in Inner Mongolia,Tongxin-Lingwu,the junction zone of Shanxi-Hebei-Inner Mongolia and Houma-Yuncheng,remain constant stress accumulation state. Combined with the stress state reflected by multiple-seismicity-parameter-value combinations and fault habit,the probability of strong-earthquake is the highest in Dengkou-Wuyuan, Inner Mongolia,but the urgency of that in the near future is not strong. The risk of Tongxin-Lingwu area enhances a little. The risk of the Houma-Yuncheng area still continues. The risk of junction zone of Shanxi-Hebei-Inner Mongolia decreases a little. The probability of strong-earthquake on other sections is small in the near future.