Morphological and histological studies on the digestive system of the Amur sturgeon, Acipenser schrenckii showed that it has stomach, pyloric caeca and valvula intestine, and its pancreas has developed into an independent organ and also disperses into the porta hepatis of liver. There are some differences between A. schrenckii and A. sinensis in the number and shape of mucous membrane pleat in oral cavity, and also in the number of the subsection of esophagus, i. e. A . schrenckii has three subsections but A. sinensis has two subsections. A . schrenckii. s valvula intestine has seven spiral valves, less than those of A . sinensis. The pyloric caeca of A. sinensis is composed of seventeen little bursa, and A . schrenckii is between ten and twelve ones.