In order to investigate the fast Cook-off response of an elementary insensitive explosive ANPyO (2,6-dia-mino-3,5-dinitropyridine-1-oxide)warhead under constraint conditions,external burning experiments were performed on five warheads with different constraint conditions,with the varied temperature data in the warhead collected.The results show that under external burning condition the temperature of explosive close to cylinder center of ANPyO warhead is far be-low the ignition temperature.The charge can not be ignited unless the constraint conditions exceed specified qualification. The constraint conditions have spositive and a negative correlation to the delay time and response level,respectively.The constraint intensity,however,exerts little influence on the ignition temperature.%为研究约束条件对单质钝感炸药ANPyO（2，6-二氨基-3，5-二硝基吡啶-1-氧化物）烤燃弹快烤响应的影响，对5种不同约束强度下的ANPyO烤燃弹进行了外部火烧试验研究，并对烤燃弹反应过程中的温度进行了数据采集。结果表明：在外部火烧条件下，ANPyO烤燃弹药柱中心的温度远低于炸药点火温度；烤燃弹的约束强度必须大于特定条件才能使ANPyO点火，且其点火延滞时间与其约束强度成负相关，而最终响应的剧烈程度与约束强度成正相关，但约束强度对点火温度影响很小。
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