Decentralized Identifier (DID) technology is a technology that uses blockchain technology to prove an individual's identi ty through information owned by the individual rather than through a central system. In this paper, we would like to pres ent an access control system using decentralized identifier technology. The access control system using decentralized ident ifier technology (DID access control system) is a system that allows users to verify their identity from the DID blockchai n server through their smartphone (mobile employee ID) and access when they are confirmed to be registered in the acces s control system. Through this, access control can be managed only by verifying identification with smartphones (mobile employee ID) and DID blockchain servers without having to store information to prove an individual's identity in the acce ss control system.