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Based on the knowledge about today's systems of water quality auto-monitoring and managing at home and abroad, a wireless monitoring system of water quality based on GPRS has been designed in this paper. And the model for water quality state recognition is established by BP neutral network based on water monitoring data. The software for wireless monitoring and assessment system of water quality is developed by using C++ Builder language and Matlab. The database is developed by using Microsoft SQL Server 2000.The experimental results show that the developed system which combines the wireless communication technology with the monitoring technology can greatly improve the real-time and continuity for the water quality state monitoring.