Wasp is a water quality model system proposed by the U.S. Environmental Protection Agency. It can be used in different environmental pollution decision-making systems to analyze and predict various water quality conditions caused by natural and man-made pollution. It can simulate hydrodynamics, one-dimensional unsteady flow of rivers, three-dimensional unsteady flow of lakes and estuaries, conventional pollutants (including dissolved oxygen, biological oxygen consumption, nutrients and algae) The law of migration and transformation of pollutants (including organic chemicals, metals and sediments) in water is called universal water quality model.