Based on the traditional VARI technology, a new generation of low cost liquid molding technology has been developed to satisfy the mass production demands of aeronautical composite structure. The proposed multiple approaches are applied to control the resin pressure difference between the injection and vent location and the flow control of the resin during the molding process.The results of the comparative experiment show that the thickness uniformity of the composite laminates molded by the new liquid molding technology are comparable with those of the laminates molded by prepreg/autoclave process. Applying the new liquid molding technology, the molded civil flap has good appearance and internal quality satisfying the application requirements of aeronautical composite.