Anonymous proxy signature is suitable for the situation where the proxy signer's identity needs to be kept secret. The verifier needs to reveal the real identity of the proxy signer with the help of the original signer. A new ID-based anonymous proxy chameleon signature scheme based on bilinear pairing is proposed in this paper. This scheme is based on Gap Diffie-Hellman group and meets the security requirements such as verifiability, un-forge ability, anonymity, traceability, Prevention of misuse, non-repudiation and Message hiding.