Based on the site error optimization model, the lightning flash data in Shenzhen are analyzed and corrected. The lightning location system of Shenzhen is introduced, and the site errors of the lightning location system are analyzed, the lightningradiated electromagnetic field are calculated and analyzed with the improved transmission line model under real surface environment. Based on the site errors and site error model, the lightning flash data in Shenzhen are corrected. The results show that the irregular terrains with different azimuths have different effects on the electromagnetic waves of subsequent strokes. With the increasing root mean square of the height of irregular terrain, the peak value of electric field reduces and the waveform risetime increases. Meanwhile, the risetime of electric field waveform varies with the changes in azimuth, which may bring some errors in using the TOA (time of arrival) location method. To verify the reasonableness of the site error model, the optimization accuracy in the covered area of the lightning location system is also calculated and analyzed. It is found that this optimization method is feasible and reliable, and the location accuracy of the optimized lightning scheme is significantly improved.