Abstract: Nonlinear interaction between the whistle mode wave and the electrons in the magneto-sphere reduces the electron's pitch angle and makes some electrons precipitating into the ionosphere,which enhances the local ionization and induces Trimpi Effects.In this paper the equations governing the wave-particle interaction are given and the Super Particle Mode,Long-Time-Scale-Method are used to simulate this nonlinear process.The results of the simulation are as following: (1) When the electrons meet the whistler wave,there occur the phase focus of resonance electrons and phase bunching of unresonance electrons.The resonance electron oscillate asymmetrically in he space (-4)-μ during the interaction.(2) The inhomogeneity of the earth magnetic field causes the shift of center angle of trapped region and has influences on the whistler wave trapping electrons.(3) This paper also gives the curves of energy flux of the electron precipitation with time at the altitude of 1000 km above the earth and the curves of energy distribution of the precipitating electrons.