The utility model discloses a confirm pollutant distribution's of network of waterways intersection experiment analog system, its structure includes two upper reaches water tanks, low reaches water tank, the flat basin in the upper reaches, the flat basin in low reaches, the pipeline that draws water, variable frequency pump, flat water grid, electric -magnetic flow meter, the husky board of rectangle organic glass in the district of awaiting measuring, wherein from the low reaches water tank draw one draw water pipeline loop to two upper reaches water tanks, variable frequency pump and electric -magnetic flow meter be equipped with on every the pipeline loop that draws water, the flat basin in the upper reaches meets with upper reaches water tank to flat water grid has been put in the junction, the interior rivers of steady basin, the flat basin in low reaches communicates with each other through tail -gate and low reaches water tank. The advantage: 1 )Be applicable to the different network of waterways in angle of converging in the network of waterways district pollutant distribution simulation that crosses, 2 )The accessible change is converged than research because of the different merging area pollutant distribution differences that lead to of the on -the -spot river discharge of in different periods, 3 )The network of waterways can provide scientific instruction for crossing district's pollutant distribution law research and network of waterways improvement.