Based on the positive dipole structure of thunderstorm,combining with satellite data and radar data,this paper analyses the electric fields on the ground aroused by different electricity structures of thunderstorm.Results show that the higher center position of the positive charge and the lower ones of the negative charge will lead to stronger induced negative electric field,all of these will make the occurrence of cloud-to-ground lightning easier.When the cloud-to-ground lightning happens,the negative cloud-to-ground lightning takes place first and consumes some negative charges,then the positive ones will distribute in the plume,which will easily cause the occurrence of the positive cloud-to-ground lightning.Through analyzing radar data and satellite image the cloud-to-ground lightning location can be seen.