Green house vegetable land is increasing rapidly in north China. The area and spatial information of green house vegetable is indispensable to reasonable development and scientific management of vegetable industry. This paper intends to explore rapid and accurate information acquisition methods of green house vegetable. Taking Qingzhou city of Shandong province as the study area

using digital TM data

based on the systematic spectral analysis of main land use types

we built an index model which can make greenhouse vegetable information exceptional. Meanwhile

through determination of green house vegetable distribution area

employing masking and using the background data and expert knowledge

the greenhouse vegetable land information was accurately extracted. The results show that there is 21 375.4 hm~2 greenhouse vegetable land in Qingzhou at 2002.4.14

which concentrate in Tanfang

Zhengmu and Huanglou town. This technique will have a consulting value to the greenhouse vegetable information extraction using remote sensing technique and provide technical support for the rational development of the vegetable industry in the study area as well as in Shandong province.