Specialty. According to query Baidu encyclopedia information shows that hemp seed (tho ma) is a specialty of Gansu, is an important local economic source, so not banned. Gansu hemp seed, taste sweet, sex flat, return to the spleen, stomach, large intestine meridian, efficacy laxative, moist and dry to kill worms, clinical name of fire Ma Ren, fried fire Ma Ren, medicinal value is huge.