Abstract: Constructing the function of the farmers’ credit decision-making based on the theory of information entropy and using the case of the rural of Huabei plain area, this paper has searched the influence on the income and the payout of the farmer household by information entropy and the influence on the demand of the farmers’ credit. Therefore, the finding is that information has different influences on the income and the payout of the farmer household and that the demand of the farmer household’ credit is not fully valid because the rural information isn’t transmitted smoothly. At last, the paper indicates that it is the important approach improving the validity of the farmer credit demand to constitute the perfect mechanism of transmitting the rural information.