A test method for verifying installation validity of a peripheral component interconnected (PCI) devices on an electronic device having a test module, comprises the steps of: (a) storing information of onboard devices and slots on motherboards of different electronic devices and information of PCI devices added in the slots of the motherboards in a first data storing device; (b) storing a bill of material (BOM) showing all possible configurations of the different computers in a second data storing device; (c) generating a configuration file according to the BOM and information of the motherboards and PCI devices; (d) the test module in the computer checking actual hardware configuration of the computer and comparing the actual configuration with the corresponding information recorded in the configuration file; (e) outputting a test result.