Professor Zhou Ping, et al. has proposed a scheme of forward secure proxy blind signature. This study analyzes the scheme, and points out the problems that information owners can deny the signature scheme. That is, the owner denies that the signature information is provided by themselves, which may be fake. The improvement is put forward based on the above analysis. The experiment shows that the improved scheme not only keeps the excellent qualities of the original plan, but also solves the problem of the information owner's denial of signature.