There are many kinds of realizations of embeded system microprocessor and operation system. According to the wiring harness test applications characters of industry scene, this paper design a strong functional wiring harness test apparatus, which use the S3C44B0 as the system processor, the CPLD inside logic circuit as the wiring harness test modules, and realize the input and output interface connecting with the ARM communications. This apparatus will have wide application foreground in the industry wiring harness test field.