According to analysis of the No. 0414 (Rananim) Typhoon’s background situationand satellite cloud pictures, we reveal the factors that influence the movement path of theNo. 0414 Typhoon. The result shows that:subtropical high、typhoon’s inner force and itsstructure are the main factors that cause the movement path of the No. 0414 Typhoon.Westerly trough is the indirect factor that affects the path of the No. 0414 Typhoon.