Abstract: In order to understand the basic characteristics of thunderstorm electrical environment in Wenchang, this paper employs the atmospheric electric field and rainfall data to analyze the showery precipitation in summer in Wenchang corresponding to different types of electric field characteristics, as well as the relations between precipitation and flash frequency. The analysis shows that lightning-free showery precipitation corresponds to small extremes of the electric field; the electric field generally varies in antisynchronization with precipitation. Prior to the occurrence of lightning, overhead single-cell thunderstorms experience disturbance in the electric field and usually significantly about 15 to 30 minutes before the electric field passes the zero point; their first lightning generally occurs about 20 to 30 minutes earlier than the precipitation does. Statistics of a number of strong showery precipitation from single-cell thunderstorms shows that before and during the showery precipitation, lightning is more intensive than in the late period and there is some proportional relationship between rainfall intensity and lightning frequency. When a typical single-cell thunderstorm gets into recession, its electric field changes in remarkable damped oscillation (EOSO, end of storm oscillation).