In order to improve the performance of rice seed germination, cold plasma processer with the medium of air and helium (He) in vacuum environment was used respectively to process three kinds of rice seed, Zheyou023, Xiushui134, and Zheyou6326. The powers used in processing were 60W, 70W, 80W, 90W and 100W. The germination test was conducted after cold plasma treatment. It turned out that the cold plasma treatment had obvious promoting effects to rice seed germination when the power was 60W to 100W. Compared with the untreated group, germination vigor of the above three experimental groups increased by 1.75% to 13.5% with the air and helium (He) processing medium, while the percentage germination increased by 1.0% to 8.75%. The best treatment power of Zheyou023, Xiushui134, Zheyou6326 were 90W, 100W, 80W in air processing medium, respectively. And when it came to helium (He) medium, Xiushui134, Zheyou6326 were better to be processed at 60W. Zheyou023, however, was not suitable to treat in helium (He) condition. 