FY4A is the first static meteorological satellite carrying a Lightning Mapping Imager (LMI), and the software implanted in the heavyloaded chips which can be renewed automatically by receiving the signals from the earth station in 2 ms, is able to complete the data processing for the multipleframe lightning signals in 400×600 pixel and generate the data in time, from lightning and ground marking objects. FY4A is a kind of SEU (Single Event Upset)sensitive device and needs to use numerous methods to make a SEU protection due to the complexity of the nearearth environment. In the construction project of the ground application system of Satellite FY4, in accordance with different effects of FPGA SEU on lightning detecting equipment, combined with data logical relationship amongst lightning affairs and systematic resources, we designed and arranged a singleevent (SE) testing program and achieved the FPGA (Field Programmable Gate Array) SEU abnormity automatic identification. Meanwhile, according to the characteristics of lightning observation and the efficient requirement of lightning detecting equipment, we use multiple comprehensive methods such as automatic judgment and order, dynamitic and timed refreshments, software and hardware recovery, etc., to secure an automatic recovery of FPGA SEU. Based on the above, the FY4A LMI has dramatically avoided the negative effect of SEU on lightning detecting equipment.