Abstract: The powerful middle-latitudinal force is of the most important active force on the Earth,which affects our planet 's in broadest range. It is not only the active force forming the oceanic circulation flow, but also forming the at- mospheric circulation flow, thus producing centrifugal motion of all matter situated in middle-latitudinal zone(21°33′~68°27′). When typhoon enters the middle-latitudinal zone, it will obviously be affected by the force and eventually kept moving in the direction of the force orientation. The force will also play certain role to matter situated in polar zone.

Key words: latitude, force, atmosphere, movement, the earth