Abstract: Various economic coefficients are the foundation of the input-output method. Through direct and complete measure of interindustrial relations, this paper goes into construction, diversity and relationship of the indicators with relevant important coefficients, influence coefficients and inducing coefficients, then elucidates its economic meanings and limitations. This paper calculates relevant indicator value with 1997 Input-Output Table of China, and discusses some problems about its application. It tries toenhance and perfect the application of input-output analysis. This paper concludes：the system of interindustrial relations indices in the Input-Output needs to be improved. In the respect of explaining economic phenomenon, the weighted influence coefficient and weighted inducing coefficient are better than the simple ones, at least are the helpful supplement of the latter.