The partially blind signature scheme is an important foundation signature scheme widely used in anonymous applications such as electronic cash, electronic payment and electronic voting. Through the crypt analysis of the ID-based partially blind signature scheme proposed by Yin et al. We find that there are forgery signature defects between multiple users in the scheme. The attacker can forge the signature by indexing the key parameters and using the repeated parameters. We therefore propose an improved partially blind signature scheme and it proves to be existentially unforgeable against adaptive chosen message in random oracle model. The new signature can resist indexing attacks and be applied to certificateless  electronic voting occasions.