Abstract: For the needs of higher power microwave source system, a microwave source based on ultra-high peak-power transmitter technology is proposed in this paper. A 200MW high power microwave source verification system is created, which provides a new way for microwave source technology research. Some critical technologies are broken through in this system, such as compact design of 65MW high power klystron transmitter technology, 200MW power compression technology, ultra-high power phased array antenna, ultra-high peak-power transmitter monitoring and anti-interference technology. The application status and characteristics of microwave source are introduced. The composition of this microwave source system along with the critical technology and concrete solutions are stated. Design of improved modulator in transmitter is presented in detail. Also, the waveform of pulse transformer and the electromagnetic characteristics of cable under high pressure are simulated. At last, three research approaches of microwave source are compared, after which some improvement suggestions for microwave source system are given.