To adapt to the centralized computing electronic and electrical architecture under the trend of "software-defined vehicles", this paper conducts adaptive development and optimization design for the digital key system. First, sort out the evolution logic of automotive electronic and electrical architecture from distributed, domain control to vehicle-cloud integrated centralized (EEA 3.0); Furthermore, the pain points existing in the traditional digital key system under the distributed architecture, such as functional independence, insufficient log storage, and weak data collaboration ability, are analyzed, and an adaptation solution based on the EEA 3.0 architecture is proposed.