Based on the technology of GIS and RS

applying the land use coverage data and DEM

the status of cultivated lands

and relations between the cultivated lands and landform in the areas of the middle and lower reaches of the Jialing River were analyzed

we also investigated spatiotemporal variation trend of cultivated land resources in the past 50 years.Results indicate the cultivated land area decreases abruptly after a long-term increase

but structure of the increased lands is unreasonable.So we must pay attention to both quantity and quality

which helps to the ecological environment construction

cultivated land resource uses

reforesting formerly cultivated land inspection

food security and so on.