Abstract: At first, based on analyzing the actual calculation method of the hydraulic deviation rate and flux deviation rate, the ground deviation was presented and defined, the calculation method was set up, and the manufacture deviation rate of the drip douche was redefined. Second, taking into account comprehensively the manufacture deviation, the hydraulic deviation and the ground deviation, the authors deduces respectively the formula for calculating the flux deviation rate based on the influence of different deviations, and deduces the method that is used to calculate the integrated flux deviation rate and ultimate integrated flux deviation rate. The research results provide the more accurate technological guidance for designing the micro-irrigation system engineering, which is expected to make the practical operational target in good agreement with the designed target of the micro-irrigation system.