Abstract: In order to solve the problems of pipe blocking and high wear rate of pipeline during filling mining process at Sanjing working face of Taoshan Mine，industrial tests of gravity and pumping transport are carried out by adopting the fluid mechanics theory，in combination with the practical situation of the working face.The ANSYS simulation was made to analyze the effect of different slurry concentration and pipeline diameters at the given speed 2.0 m/s on the entire pipe pressure.Simulation results showed that under the given delivery speed，when the filling slurry concentration values at 52% and pipe diameter ranges from 140 mm to 180 mm，which are within the reasonable control and makes slurry transport easy，the pipeline pressure are 134.561 kPa，and ranges from 130.053 to 138.759 kPa respectively.Industrial tests together with the simulation indicated that the problems of pipe blocking and high rate of pipeline of slurry transportation are solved and backfill mining obtained good effect.The pilpline system can effectively control the deformation of roof and floor，reduce the roof subsidence and lower the environment.It is approved that it is a kind of “safe，economical，environment-friendly and reliable” filling mining system.It provides reference for filling mining of the mine and similar mines.

Key words: Filling mining, Fluid dynamics, Pipeline, The entire pressure pipeline