Research conclusions: The correlation degree of the soil mound pile is decided by making gray correlation analysis． With the aid of the linear—weighted method，the gray model is integrated with BP neural network to optimize the noisy—reduction for sole model．By adopting parallel gray neural network，the effective static load test data of sole pile in the area of the similar soil layer are predicted，and the errors are compared．The results indicate that overall factors could be considered in this approach，and the decisions of missing data remedy in the test，fitting of known settlement，prediction of future settlement and reference value of foundation pile settlement have practical values in correlation region．