The thermal effects of LD end-pumped Nd:YAG high-repetition-rate solid laser during the optical pumping are the important factor which affects the laser output characteristic and the system integrated performance. Starting with the thermal conduction function, the numerical value of temperature steady distributing in the laser crystal is found by the finite element method. And thermal lens effect is counted and analyzed. Then the separate parameters design of thermal insensitive cavity is processed to compensate the thermal lens effect by the propagation-circle and transform-circle graphic analysis and design method. The study establishes the base for optimizing the design of laser to improve the stabilization of laser output.