In order to solve the problem that the other RF propagation delays cannot be measured in non-closed channels when phase calibration is performed for the phased array channel based on a vector network analyzer,a phase calibration method is proposed for transmitting phased arrays based on power accumulation.The power synthesis efficiency of the phased array is directly mea-sured from the perspective of the energy domain,avoiding the phase delay effect caused by the channel differences of the signal sources and each array element.The calibration testing process is given,and a certain L-band transmitting phased array equipment is tested.The test results show that after phase calibration,the power synthesis efficiency of the phased array can reach 91.9%,which greatly facilitates the recovery of the technical status of the equipment.