Although adaptive optics technique without a wave-front sensor can get rid of the restriction of the terms of wave-front aberrations and is an effective way to compensate the wave-front distortion of the high power laser beam to improve the beam quality,the laser intensity fluctuation and the circuit noise will make the performance of the system deteriorate. The influence of intensity fluctuation and the circuit noise on the results of the beam cleanup system based on stochastic parallel gradient descent (SPGD) algorithm is analyzed,corresponding experiments is done. Result shows that when the frequency of the laser intensity fluctuation is faster than or equal to the disturbance rate,the performance of the system decreases quickly with an increasing amplitude of intensity fluctuation. In the case of low intensity fluctuation rate,the capability of anti-jamming of the SPGD algorithm is excellent. To avoid the influence of the intensity fluctuation and the circuit noise on beam cleanup system,beam cleanup technology based on normalized performance evaluation function:power-in-bucket (PIB) is proposed. Both theoretical and experimental results show that this technology is an effective way to avoid the influence of intensity fluctuation and the circuit noise on beam cleanup system,ideal results approaching the correction limit of the system can be obtained.