An access system including a storage medium and a host is disclosed. The storage medium includes an identification code. The host includes a processor, at least one connection port and an identification port. The processor executes a mass-production application program. The connection port is coupled to at least one electronic product. The identification port is coupled to the storage medium. When the mass-production application program is executed, the processor determines whether the identification code matches a key code. When the identification code matches the key code, the processor writes mass-production data to the electronic product.