Using the multi-sector and multi-object integrated land assessment model ofCanadian Environment Service by Yin and Cohen, this paper develops a climate changeimpact study model suitable for the Yangtze Delta.

This paper holds that impact study has three stages or levels: the raising of impact hypothesis; the literary analysis to see whether and how impact exists; the study of how impact receiver overpasses the impact.

The development of comparative literature has made the traditional impact study face a new issue.

On the "Dissemination Research" in Comparative Literature ——its method, significance, and value as well as its difference from the "Influence Research;

The methods of influence research and parallel research are very valuable examples to the modern literature study.

However, in the view of Variationolog, the Influence Study expands the thought space, reflects the variant phenomenon of literature communication.

In comparison with the influence study and parallel study,the focus of attention of cross-civilization heterogeneity study has completely changed.

Among the study methods of comparative literature, influence study causes the most errors.