The present invention discloses methods for increasing chromium in white kidney bean. The method comprises preparing field, performing a first treatment to the seeds of the white kidney bean, performing a second treatment during the seeding period, performing a third treatment during the flowering period, performing a fourth treatment during the fruiting period and performing a fifth treatment during the maturing period. Meanwhile, the amount of chromium in the white kidney bean produced according to the present invention is from 400 to 800 g/kg.