Abstract: In order to improve radar radio frequency stealth ability, a novel method of radar power self-adapting control is proposed.Firstly, at the same time of guarantee of certain detection probability, radar power classification criteria is achieved by k-means algorithm with radar cross section ( RCS) of varying size and distance obtained by passive detection system. Secondly, it regards maximum power in the expected direction and minimum power in the other directions as the objective functions. Then an improved multi-scale quantum harmonic oscillator algorithm ( IMQHOA) is proposed, which introduces compensating factor, to solve the best radar array element switch sequence. Lastly efficiency of radio frequency stealth measures based on intercepting factor is defined. The simulation shows that IMQHOA can achieve better objective function solution and the proposed method of radar power classification has higher efficiency of radio frequency stealth measure.