The embodiment of the invention provides vehicle-mounted equipment based on an XPE (windows XP embedded) system and a design method of the vehicle-mounted equipment. The vehicle-mounted equipment comprises a processor and a first memory and a second memory which are connected with the processor, wherein when an operating system is installed at the upper part of the processor, an operating system file is stored into the first memory; when data are processed, a data storage file is stored into the second memory; the first memory is used for storing the operating system file; the second memory is used for storing the data storage file. According to the embodiment of the invention, the system stability is improved.