为探寻试样量少和无法加工成标准试块的煤层冲击倾向测定，从点载荷受力状态下的试块破坏机理分析入手，运用概率统计理论对试验结果进行分析处理，提出了冲击倾向鉴定指标，论证了煤块破坏所经历的时间能够反映煤的冲击倾向性，并进一步证明了点载荷法测定ＤＴ′的合理性和实用性。 In order to find out the coalbed impact propensity of the sample with small sample size and unable to be processed into a standard test block, starting with the analysis of the failure mechanism of the test block under the point load, the test results are analyzed and treated with probability statistics theory and the impact propensity assessment The results show that the time of coal block destruction can reflect the impact propensity of coal and further prove the rationality and practicability of point load method to measure DT ’.