Abstract: Green manure is one of the important green agricultural technologies to fix carbon and release oxygen and improve the quality of cultivated land. It is still unclear whether farmers’ concurrent work will affect their preference and heterogeneity of the environmental attributes of green manure. Based on this, this paper uses the Choice experiment method and Random parameter Logit model to conduct empirical tests on small farmers in the four provinces of Hebei, Shandong, Henan and Anhui. The results show that: （1） Concurrent Business has a significant negative impact on farmers’ application of green manure. （2） The willingness to pay for green manure of low concurrent farmers (pure farmers and type Ⅰ farmers) is significantly higher than that of high concurrent farmers (type Ⅱ farmers and non-farmers). Among them, the willingness to pay of pure farmers is 185.627 yuan/（667 m²·a）, the willingness to pay of the type Ⅰ farmers is 270.659 yuan/（667 m²·a）, the willingness to pay of the type Ⅱ farmers is 119.461 yuan/（667 m²·a）, and the willingness to pay of pure farmers is 140.875 yuan/（667 m²·a）. （3） Different types of farmers have obvious differences in the environmental attributes and options of green manure. The pure farmers prefer to improve water quality, improve the quality and fertility of cultivated land, improve air quality, and reduce the environmental attributes of natural disasters. The type Ⅰ farmers prefer to improve water quality and improve environmental attributes of cultivated land quality and fertility. The type Ⅱ farmers prefer environmental attributes that improve water quality and slightly improve air quality. The non-farmers prefer environmental attributes that improve air quality. Accordingly, it propose that: （1） formulate different policies for farmers with different degrees of part-time work; （2） promote social services; （3） increase investment in rural education and improve the rural education system; （4） broaden information channels through the Internet and radio to enhance farmers’ perception of the environment and their awareness of green fertilizer.