Abstract: The model and sonde data are applied to calculate formation of electric structure of thunderstorm in Nanchang, Lanzhou and Changdu areas respectively. The results indicate that updraft velocity is maximum in thunderstorm of Lanzhou and lasting time of updraft velocity is longest in thunderstorm of Nanchang. In developing stage, electric structures of thunderstorm in these areas are tripole. In mature stage, electric structure of thunderstorm in Lanzhou shows tripole and is formed by inductive charging and non-inductive charging. However, electric structure of thunderstorm in Nanchang shows bipolar and is formed by inductive charging. The electric structure of thunderstorm in Changdu shows bipolar and is formed by non-inductive charging. The main negative charge appears to be distributed in different height but to remain at approximately constant tempera ture (-10～-20℃) in these areas. The temperature stratification in the north of China is favorable to the formation of tripole electric structure in thunderstorm.