Abstract：“Symbol”is the key concept of Cassirer's philosophic theory of symbolic form, which Cassirer set up by renewing Kant's concept of “schema”and holding fast to symbol, the unique form of human spiritual activities, thus, the comprehension of the concept “symbol”is key to grasping Cassirer's philosophy. Cassirer expounded the concept from different angles in his works, which delineated the domain of his philosophy.

Keyword：Cassirer;symbol;form;