Using the tools o f VS 2005, SQL 2005, Surfer 8. 0, etc., the regional services system o f drought monitoring and early warning and evaluating over Northwest China is built. The system is the first regional network system in Northw estern China. It is the B/ S structure and users can get much more information on meteorological drought, agricultural drought, and ecological droug ht by operating the system online. The system may supply over 50 indexes and model analysis, such as standardizatio n precipitation index, relative humid index, comprehensive drought index, Penman evapotranspiration, waterr esource evaluation, and drought disaster evaluation concerning to drought monitoring and early warning and evaluation, which all can be calculated automatically. The system is heavily integrated and automatic. Most operation processes can be finished automatically. Now the system has been used for drought monitoring and early warning and evaluation services over the northwest region for nearly two years and can supply drought services conveniently .