Based on the measuring and control technology of programmable logic controller,an automatic data acquisition system is designed to collect water level and rainfall information in different regions.The system is connected to and communicated with Internet through GPRS module,which can bring all the monitoring data together to the hydrological information center.The system is integrated with various functions such as the hydrological information telemetry,monitoring,report printing,tendency analyzing,and alarming.The actual test results verify the feasibility and accuracy of the system.