The ring signatures in the standard model have too many pairings and multiple-known-signature encounters forgery attack, so a new efficient and safe ring signature was proposed. On the basis of reducing public parameters, a Hash function with secret was introduced into every member, so it achieved the best safety requirements and had the unconditional anonymity. Compared with the existing identity-based ring signature schemes in the standard model, for n members of a ring, the signature only needs two pairings to verify without pre-operation, thus it can greatly improve the efficiency.