The principle of space drive propulsion system proposed here is derived from General Relaivity and the theory of continuum mechanics.From the gravitational field equation,the strong magneic field as well as mass density generate the curvature of space and this curved space region produces the uni-dirctional acceleration field. The spaccship in the curved space can be propelled in a single dircction. Since the force they produce acts uniformly on every atom inside the spaceship, accelerations of any magnitude can be produced with no strain on the crcws Thc curvature of space plays a significant role.