Abstract: For studying the economic benefits of land use in Santai county,from the input intensity,output efficiency,the three aspects of industrial structure to establish the evaluation index system to reflect the economic benefits of land input and output results,By using the method of entropy function of the three county land use economy the benefit of quantitative and qualitative analysis,static and dynamic combination analysis. The land use change table check data,statistical yearbook data of three counties in 2006-2015 vertical comparison of urban land use economic benefits,the economic benefits of 10 years,and the change trend were analyzed. The economic development data of Mianyang city in 2014. The Santai County town land use economic and other Mianyang county comparison. Results indicated that ①Santai county Coordinate series of land use was in the second stage nearly 10 years,land use in state of coordination;②The input intensity of land use growing,however land use efficiency is not good;③The industrial structure get initial adjustment;④Santai was lack in funding Compared with other counties of Mianyang. Analysising by synthesis,its conclude that The coordination degree about economic benefits of land use was totality rised in Santai,but the output wasn't in direct proportion to the input. The industrial structure isn’t suitful,the way of land still need further adjustment.

Key words: land use, evaluation of economic benefit, efficacy function, entropy evaluation method, Santai county