There are three differences. 1. different morphology. Hu Ma Ren appearance is flat ovoid, one end pointed end more rounded, brown surface, smooth and shiny. The appearance of flaxseed ovoid, gray-green or gray-yellow surface, the tip of the pointed, angular on both sides, the pericarp is thin and brittle, easy to break. 2. different geographical distribution. Hu Ma Ren originated in the Mediterranean region, temperate cultivation in the Eurasian region. Now all over China are cultivated, more common in the north and southwest. Fire Ma Ren in all parts of China are planted, distributed in the northeast, North China, East China, South China and other places. 3, different efficacy. Hu Ma Ren can moisturize and smooth intestines, relieve dizziness and other symptoms. Fire Ma Ren can moisturize the bowels and laxatives, replenish gas and blood.