侦查讯问失败的原因是很复杂的，既有侦查阶段的原因，也有讯问阶段的原因；既有主观原因，也有客观原因。文章主要分析了讯问阶段的原因：侦查讯问的准备不充分；讯问策略使用不当；使用证据不讲时机、条件、方法；讯问突破口选择不当。 The reasons for the failure of interrogation and interrogation are very complicated. They are not only the reason of the investigation phase but also the reason of the interrogation phase. There are both subjective and objective reasons. The article mainly analyzes the reason of interrogation phase: the preparation for interrogation is inadequate; the use of interrogation tactics is improper; the use of evidence does not talk about the timing, conditions and methods; the improper choice of interrogation breakthroughs.