The invention provides a partially blind signature method based on identity and relates to the technical field of information security. The partially blind signature method based on identity is capable of reducing the calculation complexity and improving the execution efficiency. The method comprises the following steps: public system parameters {G1, q, 1, P, G2, e, H1, H2, H3, QPKG} are established by PSK and an integer sPKG is randomly selected as a private key for secret storage from the integral multiplicative group as shown in the description of mod q; a signer sends own identity information as shown in the description to a private key generation center, the private key generation center generates the private key Did of the signer and sends the private key Did to the signer via a security authentication channel, and then the signal obtains the private key Sid and confirms that the private key is generated by the private key generation center; next, the signer signs; a verifier verifies the validity of the signature by use of the public key of the signer. The partially blind signature method based on identity can be applied to electronic cash, electronic voting and electron transactions.