Abstract: This paper analyzes the characteristics of graphical solution method, analytical equation method and numerical method, then discusses finite element method and forward step method of the numerical method. A new numerical method, namely extended forward step method, was presented for the hydraulic analysis of the pipeline sprinkler irrigation system. Using the Bernoulli Energy Equation and Darcy-Weisbach Equaion, the equations for laterals and submains were established respectively. By successive linear approximation, the hydraulic analysis of sprinkle irrigation system with single laterals was put forward.