The general trends of the direct input coefficient change are summarized by the comparison of Chinese series input-output tables from 1992 to 2000.The studies show that both the whole input ration in the total output and intermediate consumption in the total consumption are rising with the elevation of Chinese economic level.Generally speaking,most of the industries tend to use more utilities-intensive products while reduce the inputs shares of consumption manufacturing,mining product and service.Besides,self-employment ratios within most of the industries increase.The coefficient changes indicate the systematic characters of Chinese industries' technology improvement and the economic structural system transmission.