The utility model provides one kind based on improving GA BP is in industry sewage monitoring system, and it relates to an industry sewage monitoring technical field. Does it contain into discharge port, sensor node group, basic station, GA BP neural network, play discharge port, processing apparatus, entering discharge port one side and being connected with sensor node group, sensor node group one side is connected with the basic station, is basic station one side connected with GA BP neural network, GA is BP neural network one side connected with out discharge port, GA the BP neural networkopposite side is connected with processing apparatus. After the technical solution is adopted, the utility model discloses beneficial effect does: not only have BP's nonlinear mapping ability, have GA's global searching ability moreover, combine together both, constitute GA water quality sewage is appraised to the BP network, operates GA's intersection and variation, and the weights and the threshold values that combine more than one parameter to utilize GA to optimize BP neural network on a large amount of historical data's basis utilize BP to carry out scientific and effective evaluation towater quality sewage after the scope of reducing.