Identity-based (ID based) public key cryptosystem gives an efficient alternative for key management as compared to certificate based public key settings. A proxy signature is a method for an entity to delegate signing capabilities to other participants so that they can sign on behalf of the entity with in a given context. In this paper, we have proposed a new ID-based proxy signature which is more efficient than. Then we have extended our study in developing a blind -signature and partial blind signature using the above proxy signing key. We also have analyzed security of our new scheme briefly.