Abstract: In order to use plasma electro-optic switch in repetition frequency lasers, the effect of crystal absorption coefficient,the crystal thickness, the distance between focula boundary and crystal boundary, power-intensity distribution, on temperature and strain distribution was analyzed by means of finite element method.The simulation results indicate that the heat deposit depends on absorption coefficient and crystal thickness, the temperature distribution is not only related with power intensity distribution of incident laser but also the distance between focula boundary and crystal boundary.The temperature distribution as well as the thermodynamic parameter determinates the strain field.