This paper reviews history and present situation of integration of international trade theory and international direct investment theory, analyses the theoretical origin of internal scale economy stressly, inquiries into the theoretical basis of integ.

The article begins with a summary of the theory of economy of scale,and then discusses the development status of Zhejiang civilian-run enterprises in two aspects,namely external economy of scale and internal economy of scale.

A probe into the economic scale of pulp enterprises in China;

Optimization model of economic scale of agricultural products logistics center;

Economics of scale and selecting economic scale of enterprise;

Empirical Analysis on Scale Economy ——Taking China s Automobile Industry as the Example;

Positive Analysis on Scale Economy of Automobile Industry in China;

On Scale Economy of Small and Medium-Sized Enterprises in Network Organization;

A Study of the Economical scale of shock Absorhers Employed in Sedans;

The paper expounds the economical scale and layout plan of Jiangxi paper manufacture industry which analyzes the main problem and cause,comparing the development condition of Jiangxi with other advanced province in china.