At present, the gravel-pasted filter are widely used in the water supply, precipitation, drainage, hydrological observation, geothermal mining and the repair of sand gushing tube-wells, which fully demonstrates the superiority of it, However,it\'s not used in filter water projects of surface water.

According to the difficulties of water well repairing and gravel-filling for horizontal well,porcelain granule pre-coated well screen was developed based on a lot of laboratory tests.

Real estate is a capital densely industry and finance institutions provide the real estate industry with quite a few funds, which produces a contradiction: the development of real estate will lag without financial sustainment; excess of financial sustainment will lead to real estate prosperity, even appear price bubble.