Abstract: In order to solve the problem of kidney bean germination in production, under basin culture, the authors simulated drought stress through controlling soil water, and studied the effect of different concentrations and ratios of seed and chitosan on seed germination of kidney bean. The results showed that: chitosan could improve the percentage of germination, germination potential, germination index and vitality index of seed. When the concentration of chitosan was 2% and the ratio of chitosan and kidney bean was 1:50, the germination rate was the highest, and when the concentration of chitosan was 1.5% and the ratio of chitosan and kidney bean was 1:50, the germination potential was the highest. Under the same ratio of chitosan and kidney bean, when the concentrations of chitosan were 1.5% and 2%, the index of germination was the highest, and when the concentrations of chitosan were 1.5% and 2%, the ratio of chitosan and kidney bean was 1:50 , the vitality index of seed was the best. So, when the concentration of chitosan was 1.5%-2%, and the ratio of chitosan and kidney bean was 1:50, the effect of chitosan on the kidney bean was the best, and it would build a solid foundation for future research on the seed coating of kidney bean.