Abstract: In order to lengthen the lifetime of Hall thruster，the BN ceramic channel wall was changed to diamond wall，which can improve the sputtering resistance of thruster.The diamond’s influence on magnetic field and secondary electron emission was considered to analyse the practicability. In addition，the BN ceramic test pieces with diamond film were under ion sputtering experiment by weight method. The relationship between the sputtering yield and the ion incident angle was obtained by semiempirical formulation method，and was used in particle movement simulation program to forecast the shape change of diamond channel wall to obtain the corrosion rate. The experiment results show that the sputtering yield of diamond is relative decreased by 75% compared to the BN ceramic in different incident angles. The simulation results show that the diamond is good at improving the corrosion situation of channel wall,and 0.7mm thickness diamond film can resist the ion sputtering for 5000~6000h，so it is helpful to improve the lifetime of Hall thruster.

Key words: Hall thruster lifetime, diamond, sputtering yield, sputtering experiment, channel wall erosion simulation, channel wall material