Against the background of rising urban traffic congestion and accident risks, intelligent transportation systems are undergoing a strategic transformation from monolithic intelligence to cooperative control. Vehicle-to-Everything technology provides core data support for access efficiency improvement and collision warning through real-time data exchange between vehicles and infrastructure, but its deep integration in automotive electrical systems still faces the dual constraints of protocol compatibility and arithmetic bottleneck. The distributed control model of traditional vehicle electronic and electrical architecture can hardly support the millisecond response demand of V2X, and it is urgent to reconstruct the communication scheduling and data processing mechanism. Therefore, this paper discusses the core issues such as reconfiguration of in-vehicle communication gateway, convergence of heterogeneous protocol stacks, and secure cryptographic computing offloading, in order to provide a systematic solution for the engineering of highly reliable vehicle-to-circuit collaboration system.