To investigate the bearing behaviors of lateral loading piles,we predict the ultimate bearing capacity of lateral loading pile based on BP neural network.Taking the pile diameter,depth of pile embedment,eccentricity of load,undrained shear strength of soil as the input of neural network,we obtain the prediction model of pile bearing capacity based on BP neural network.It is found that the average value of relative error of fitting value of pile bearing capacity compared with the observed value for 31 groups of independent variables training BP neural network model is 4.5%;and the average value of relative error of prediction value of pile bearing capacity compared with the observed value for 7 groups of independent variables validating BP neural network model is 5.4%.The conclusion is drawn that the prediction model of bearing capacity of lateral loading pile based on BP neural network is feasible.