The computer management system of water quality data is used to deal with the water quality data.In the system,the computation and analysis and comprehensive compilation of firsthand data,water quality as-sessment, data storing as well as pollution status map drawing can be made with the computers, The system hasnot only improved the reliability of water quality data,but also shortened the period trom data collection to pro-viding service. Considering the users'requirements for information,the concept model which follows the waterquality data law is established in the system Svstem analysis by means of hierarchy technic enables whole system to have full functions,user-friendly interface,easy operation and many kinds of outputs Furthermore.it can be run both on the VAX mini computers and IBM compatible micro computers. It has a strong applicability.