Abstract: The microwave power module（MPM）,which combines the solid state and vacuum electronic technique,is the super microwave device of the new generation electronic weapons and equipments.The microwave properties of the MPM are systematically investigated in this paper.The MPM has the advantages of wide bandwidth and power bandwidth product,because of the favorable dispersion properties of the TWT.And the MPM also makes low noise owing to the noise properties of the SSA.The stable integrated power conditioner（IPC） determines the low phase noise and spike spectrum properties,and appropriate gain partitioning determines the outstanding properties of noise figure features.The IPC＇s effect on the spectrum,the noise properties of SSA and TWT,and gain partitioning which influence are analyzed.The coherence between amplitude and phase of the MPM,as well as combing efficiency are discussed in this paper.The simulated curves of the properties are presented.The superior characteristics of MPM are proved by the measuring of one X-band MPM.It also indicates the extensive application of the MPM.