The invention relates to an artillery with a small curvature of arc cannon tube, using the principle of the centrifugal force of the cannonball movement to cling the onside of cannon tube, solved the variety problems in the produce and fixing of the long-distance long line cannon tube, and because of the small curvature of the arc cannon tube the centrifugal pressure greatly reduced, got the long canon tube which is realizable, using the lower chamber pressure steam or gas or slow-burning gunpowder pushing to get the range which muzzle velocity reaches to hundreds of kilometers even up to thousands of kilometers. The low acceleration of the arc cannon chamber is benefit for installing the cannon control and guide organization and with cold launch cover-up character.