PXSB two-ways step running complete fluidic rain gun is a new type of large-middle rotary sprinkler. The key component of the sprinkler, fluidic element, provides the driving force and controls the movement of the sprinkler based on Coanda effect. Hydraulic performance of the rain gun was tested. The main influencing factors to the range, height and rainfall distribution were analyzed. The influences of the working pressure and the structure parameters on the main hydraulic performance of the rain gun under its working states have been obtained by the experiments. The best geometrical size was achieved at the experiments, which provided a basis in building the design method of the twoways step running complete fluidic rain gun. A comparison of hydraulic performance was made between the complete fluidic rain gun and the other largemiddle rotary sprinkler. According to the results, the twoways step running complete fluidic rain gun has better performance than the others. 