Abstract: IR spectrum, SEM as well as the function parameter of chitin were used as the main methods to analyze the changes of the shrimp shell tissue and the difference in structure, function parameter of chitin, which made from three different parts of shrimp shell. The results presented that: The preparation process of chitin, chitosan used in this experiment is reasonable; The structure of three group samples of chitin and chitosan made from the shrimp shell of shrimp head, shrimp body, shrimp foot and the things contained in shrimp head are mostly consistent, but their DD and molecular weight are quite different; In three groups of samples, the molecular weights of chitin and chitosan made from the shell of shrimp head is the largest, and the DD of chitin and chitosan made from shrimp foot and the things contained in shrimp head is higher than others.

Key words: chitin, chitosan, EDTA