To analyze the influence of angle of labyrinth channels to the hydraulic performance of emitter, Fluent 6.2 CFD software was used to study the sawtooth, trapezoid and rectangle channels with the different angles. The results showed negative relationship between angle and discharge coefficient and flow state exponent when the other conditions did not change. With the increasing of angle the discharge coefficient of trapezoid labyrinth channels decreased by 19.03 percent, the hydraulic performance of rectangle labyrinth path was similar with trapezoid flow path; it was apparent change to local damage coefficient ζt with the increasing of angle，the ζt of trapezoid labyrinth path increased by 32.5 percent, but sawtooth flow path increased by 23.4 percent in the changing range of angle; when the working pressure was higher, the fraction coefficient was stabilized to value and changed nothing, the state of wateris keeping turbulence.