Abstract: In order to further improve the management ability of farmers' professional cooperatives, through more effective economic mutual assistance and cooperative operation to improve the efficiency of agricultural and rural production and improve the economic level of farmers. The evaluation index system of management ability of farmers' professional cooperatives was constructed, and taking 200 farmers' professional cooperatives in A county of Shandong province as an example, the entropy method was used to measure the index weight and the score of operational capacity; The influencing factors of the operating ability of farmers' professional cooperatives was selected, using its operating ability score as the explained variable, and using the regression analysis method to explore the degree of influence of each influencing factor. The results show that the business ability score of the farmers' professional cooperatives in A County of Shangdong province is 87.082 points, and the participation of farmers, the collective support of villages,the introduction of talents and the satisfaction of farmers are the major factors that affect the operating capacity of the farmers' professional cooperatives in this area. Finally, it puts forward some countermeasures and suggestions,such as improving the participation and productivity of agricultural management subjects, strengthening the cooperation between industry, university and research of cooperatives.

Key words: farmers' professional cooperatives, operating capacity, influencing factor, A county