Abstract: For its excellent performance and mechanical properties, low elastic modulus polypropylene fiber concrete has became one of the materials used in the main cut-off wall of water conservancy projects in recent years. Based on laboratory tests, low elastic modulus for polypropylene concrete strength, slump characteristics were studied; a set of concrete durability permeate collection instrument for polypropylene low elastic modulus of concrete was developed, and permeability and durability were studied. The test results showed that., compared with the traditional low elastic modulus of concrete, compressive strength and elastic modulus of polypmpylene low elastic modulus of concrete changed little, but with higher tensile strength, lower permeability and longer durability. These findings of polypropylene low elastic modulus of concrete will provide technical supports for application of cut-off wall darn engineering.