Abstract: The combustion chamber and tailpipe is a main part of Helmholtz type pulse-jet engine. How both the acoustics condition formed by structure parameters of five kinds combustion chamber and tailpipes and calefaction condition constituted by three kinds fuel restrictor opening affect the work frequency of pulse engines had been studied. The conclusion is that the calefaction condition intensively works on the work frequency of a pulse-jet engine in the change range of the diameter of the cylindric part of the combustion chamber in the paper,on which the acoustics condition has a little effect.