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 ahalysed. At the same time, the contribution and effect of telecom manufacturing on Sichuan's national economy are quantitatively and synthetically evaluated. It is found that the effect of Sichuan's telecom manufacturing is changing greatly from former “propelling model” to “driving model”. It proves the necessity of the preferential development of telecom manufacturing, which provides good countermeasure for the development of national economy in Sichuan Province.