There are mainly three kinds of kidney beans, which are divided into hard-pod kidney beans, soft-pod kidney beans and Jinzhou double-season beans. The hard pod kidney bean has a long oval shape, each kidney bean contains more than a dozen beans, and the shell is hard, while the soft pod kidney bean has a soft shell and can be eaten together. The height of the main stem of Jinzhou double-season bean is about 3 meters, the pod length can reach 18 centimeters, and it is green, and the weight of a single pod is about 1 grams.