Based on the micro-survey data of 513 peasant households in the upper reaches of Taihu basin in Jiangsu province, this paper empirically analyzes relationship between acreage of farmland rights certifiation (FRC) and farmers' adoption behavior of environment friendly agricultural technology (EFAT) by using Bivariate Probit model.The results show that there is an "inverted U" relationship between the area of FRC and the farmer's application behavior of organic fertilizer, in which the optimal scale of FRC for farmers applying commercial organic fertilizer is 2.6 times of the maximum size of the sample farmers' confirmed land area, and the optimal scale of FRC for farmers using agricultural fertilizer is 2 times of the average area of sample farmers' FRC.This means that the farmer's confirmed area in the sample area has not reached the optimal scale for organic fertilizer application.Besides, risk-appropriate farmers tend to apply commercial organic fertilizer, while risk averse thinks that self-produced farmyard manure is more reliable.It is critical to explore how the farmland rights certification (FRC) affects the farmers' behavior of adopting environment-friendly agricultural technology (EFAT), to improve the micro-control mechanism of agricultural non-point source pollution in Taihu basin from the perspective of the reform of farmland property right system.To improve the enthusiasm of farmers' behavior of adopting EFAT, it is necessary to integrate policy of FRC to ensure the appropriate centralized and large-scale operation of agricultural land, establish a risk guarantee mechanism of adopting EFAT, and promote a virtuous cycle of agricultural production and ecological environmental protection.