In order to improve the detection efficiency and location accuracy of three-dimension location system of lightning VHF radiation(LLR), basing the principle of LLR, the possible sources of error were analyzed. This study focuses on the error from GPS, A/D card and the position of station which were considered as sources for system error. The time signal from GPS showed a normal distribution which lead to the corresponding error of trigger time. The accumulated error in data was resulted from the unstable crystal oscillator, and it could affect the accuracy of location result greatly. The position error of station was resulted from GPS orientation system, and its correction would be depends on the long-term observation on fixed observation sites. Considering these errors, the difference value, between arriving time detected by receiver and arriving time calculated base on the location results, were fit to a straight line. The evolution rule of error was analyzed and corrected base on this line. And the detection efficiency of LLR was improved greatly and location results of LLR were more credible.