Employing the choice experiment method in surveying 570 family farms in Huang-huai-hai Plains,this paper processes the information on attributes neglected in grain family farms and analyzes preferences for different support policies and the characteristics of grain family farms with heterogeneity preferences with the assistance of mixed logit and latent class models.Results show that the model using inferred attribute non-attendance method has the best fit; policies comprising agricultural subsidy,credit support and technical support are preferred by grain family farms; the preference of grain family farms for policy communication channel cannot be ignored; grain family farms with high education level,reasonable land scale and high cognitive competence to supporting policies are expected to increase profit rate in front of the same policy;there are four types of grain family farms,namely the capital-preferred,the knowledge-and-technology-preferred,the land-transfer-preferred and the policy-preferred.Family farm supporting policy must be formulated on the basis of heterogeneity preferences,and the supporting policy should be appropriately inclined to the preferred agricultural subsidy,credit and technical support.Family farms with highly-educated farmers,reasonable land scale and high cognitive competence must be intensively supported.