Through reviewing on increasing returns theory, this article divides the online information services provided by ICP into two classes: the ways information goes through are website-customer and customer-website-customer respectively.

In terms of compatative advantage and increasing returns,international trade theory explains the causes for the ocurrence of export trade.

The study shows that the product quality under decreasing returns is lower than that under increasing returns without network externality; but with network externality the quality of high_quality product .

Increasing Return,Development Strategy and Regional Economic Segmentation;

Factors such as development resource, cost structure, learning effect, cooperation effect and deep customer groove in determine that the mechanics of increasing return play an important role in the development of information industry.