Abstract: Proxy signer privacy protection is one of the important researches for the strong proxy signature.First，we do research on the Shum and Wei’s privacy protected strong proxy signature scheme.We point out that the original signer’s forgery attack to Shum-Wei scheme presented by Sun et al is invalid.Then we propose a valid attack.And we improve Lee et al’s original signer’s forgery attack.We also point out that there is redundant data in Shum-Wei scheme’s signature.Second，we present a new strong proxy signature scheme with proxy signer privacy protection which can keep the property of the strong unforgeability and has a more compact signature.At last，we design a proxy multi-signature scheme based on the new scheme.