With the aims to overcome the drawbacks of end-outlet discharge in mine filling with pipeline transport by gravity,the flowing status of slurry in pipeline transporting by gravity was studied,a isometric flow distribution technology applied to slurry discharge in filling.Also,referring to hydraulics research achievements about multi-outlet discharge,the theoretic analysis and formula deduction for the isometric flow distribution technology of filling slurry were carried out,a discharge pipeline of transport system of filling slurry was designed.The field test results showed that the homogeneousness and strength of filling mass,stability of filling system were improved owing to the application of the isometric flow distribution technology.