In order to better control stratospheric airship ascending stage and accelerate its ascending speed, construct the stratospheric airship 3-dimensional portrait dynamics equation. After analyze the problem of slow ascending speed of the semi-control scheme of ballonets, a new control scheme that depend on static lift, airscrew thrust and aerodynamic lift to ascend in the ascending stage is presented. According to these two schemes, the comparison controller is designed. The feasibility of the composite control scheme is tested by computer simulation.