Abstract: From the pulp density transportation，pipe diameter and velocity，respectively，a finite element model different from filling slurry pipeline pressure to influence factors，the pipe to the parameters of the comparative analysis.The analysis results show that 78% of the pulp concentration for filling the maximum concentration of pipe，deep well filling，small diameter filling tube to filling slurry pipe full，and thicken filling tube bending place wall.

Key words: Pulp concentration, Conveying flow, Pipe diameter