The thoughts of comprehensive treatment about ecological crisis of Shiyang River drainage area in this study are as follows: ①use the threshold value of arable area per person under certain standard of living and the theory of optimal protective effect of forest coverage to determine the arable area and its matched shelter forest system.

The paper discusses the dynamic characteristic of population supporting capacity of land from three aspects;the threshold area per capita,the absolute supporting capacity and the relat.

This paper discusses per-person cultivated land area of land expropriated unit, analyses the necessity of abolishing upper limit of compensation of land expropriation through mathematics model and contrastive analysis.

This paper,helped by Excel software and based on the analysis of dynamic fluctuation of cropland,population and grain output since Henan Province opened to the outside world,analyzes variant characteristics of minimum cropland acreage per capita and pressure index on cropland.

By using regression analysis and prognostic theory,the minimum cropland acreage per capita,and cropland pressure index model were analyzed with the consideration of changes in cropland,population and grain output since enforcement of the reforming policy.