Keywords: 
• 高温反应堆 /
• 瞬发中子代时间 /
• 反应堆物理计算 /
• 蒙特卡罗方法

Abstract: High temperature nuclear reactor in the field of MHD power generation and nuclear rockets have good application prospects.High temperature reactor has a pile of high core temperature, complex structures, whose physical performance parameters are rather difficult to compute.This paper studies the high temperature nuclear reactor prompt neutron generation time calculation method, introduces the calculation principle of a variety of methods and a new high temperature nuclear reactor's calculation results.The results show that for the same reactor model, calculation results of several methods are in good agreement and the calculated results are credible.