Abstract: A pulse detonation engine(PDE) with diameter and length of 61mm and 1140mm respectively,was used to get the heat loads of detonation tubes which were designed into two types.The first one is that its heat transfer was controlled by natural convection and thermal radiation,and the other one was mainly influenced by forced convection.The same relations between heat load and working frequency were acquired in two conditions,namely,the heat load increased along with the increase of working frequency.However,with the doubling of the frequency from 20Hz to 40Hz(or from 25Hz to 50Hz) of the detonation tube,the heat load increased more than 100%.In addition,the vaporizing rate of kerosene was got at different frequencies,providing a reference for the design of PDE evaporator.