ID-based public key cryptosystem can be a good alternative for certificate-based public key setting. This paper provides an efficient ID-based proxy multi-signature scheme from pairings. In the random oracle model, we prove that our new scheme is secure against existential delegation forgery with the assumption that Hess’s scheme-1 is existential unforgeable, and that our new scheme is secure against existential proxy multi-signature forgery under the hardness assumption of the computational Diffie-Hellman problem. This paper provides an efficient ID-based public key cryptosystem can be a good alternative for certificate-based public key setting. This paper provides an efficient ID-based proxy multi-signature scheme from pairings. In the random oracle model, we prove that our new scheme is secure against existential delegation forgery with the assumption that Hess’s scheme-1 is existential unforgeable, and that our new scheme is secure against existential proxy multi-signature forgery under the hardness assumption of the computational Diffie-Hellman problem.