The less emphasis on yield-increasing input and more emphasis on labor-saving input are the main reasons for a slow increase of yield per unit area after 1996.

It becomes an important operation significance to study the non-linear input-output model,because the economic system obviously shows the non-linear character.

This paper based on incremental input-output analysis, makes some research on some theoretic and practical issues in incremental input-output analysis.

Geological prospecting input-output mechanism and central geological prospecting fund opertaion;

Papermaking industry should be given priority in development——An input-output analysis of papermaking and paper products industry;

Analysis on Input-output of Beet-sugar Factories in Xinjiang;

Based on the input output techniques,the data integrated management system in gold mine,classification and analysis system of economic technique indexes,tools box of system analysis,and friendly user interface are established.

Through the analysis model of economic effect and the data of the Sichuan Province input output from 1987 to 1997, the state of economic effect of telecom manufacturing for 10 years is analysed.

According to consuming demand, the model of consumption tracking dynamic input output sysstems is revised, and a target function for optimal production process is introduced.