According to the types of lightning protection systems for existing lightning detection，more measuring points scattered, complex method, detection test records and unautomation of data storage, A Multifactors lightning protection Tester is designed based on the STM32. The equipment is Combined With The Modern electronic technology and data processing algorithms. Digital machine integrated, interactive, multifunction, automatically recording and storing data, realtime information exchange with traffic control system functions are achieved. The tests proved that the tester has a good accordance with the Existing instruments CJ1007 and ETCR3000B when measuring the parameters of SPD resistance and Soil resistivity. The accuracy of data meets the designing requirements. The proposed equipment has been put into use and is well received by customers.