Abstract: It is of great significance to study apple growers' replacing chemical fertilizer with organic fertilizer for making the incentive policies of chemical fertilizer reduction in China. Based on the survey of apple growers in Shaanxi Province, this paper analyzed the effect of different social networks on the different modes of replacing chemical fertilizer with organic fertilizer. Research shows that different social networks have different effects on the adoption of different modes of replacing chemical fertilizer with organic fertilizer. Horizontal social network which is denoted by the communication degree between apple growers and their relatives or neighbors had a significant positive effect on the adoption of the organic fertilizer plus formula fertilizer mode by apple growers. Forward social network which is denoted by the communication degree between apple growers and fertilizer retailers and oblique social network which is denoted by cooperative membership separately had a significant positive effect on the adoption of the organic manure plus integration of water and fertilizer mode by apple growers. Backward social network which is denoted by signing the sales contracts with apple dealers has a significant positive effect on the adoption of the organic fertilizer plus formula fertilizer mode and natural grass plus green manure mode by apple growers. However, the influence of social network on the adoption of livestock-biogas-fruit mode was not significant. Therefore, the paper suggests that developing contract production mode, promoting mutual assistance and cooperation among apple growers, promoting communication between apple growers and organic fertilizer retailers and apple retailers, and extending organic fertilizer use by web media or other information channels are important to promote the organic fertilizer use.