Temperature field analysis of water immersion temperature rice seed soaking germination equipment was analyzed by finite element method. Simulation analysis showed the highest temperature during soaking appeard in the edge of rice in contact with water. The lowest temperature appeared in the center of rice seed. With the increasing of germination time, the heat transferd to the center of rice seed continuedly. The center temperature reached to 25℃ and the highest temperature reached to 31℃ after 23h, then the temperature of rice seed reached to the optimum tempreture of 25~31℃. Experiment result was consistent with the simulation results.