A computer service system.which was suitable for program and management of small watershed harness, was designed by modern technology, it could replace many daily complicated work of information processing, enable the program more scientific and normal.shorten the period of program formulation.and satisfy the needs of soil and water con"ervation work in time.The system takes GIS as the key, reads topographic map, relevant data and characters into computer as the basic data.makes two kinds of this data to set up a logical relationship, and combines factors of society.economics.natural and human activity with space coordinate as an organic whole.The system managed data ate analyzed synthetically with methods of integrating linear and unlinear, statte and dynamic and multiobjective plan etc.with expert system, then, the HHRLIS system is set up by using higher computer language