Rectangular membrane bag fabric filters on the cloth, can according to the construction technology of filling concrete or mortar, after molding, full of concave and convex, forming beautiful, no point type membrane filter bag is four layer structure of double-layer fabric, fabric between the second and the third layer formed cross bar, climbing up and down filling molding is the designed thickness, has high compressive strength of hardened body, forming the characteristics of the beautiful, the product use and wide, is currently the most widely used a membrane bag. It gen- erally applies to the reservoir, river, reservoir bank protection, slope protection, dike, bottom protection and other projects.