Abstract: In the design of composite foundation, how to accurately estimate the bearing capacity of soil among piles is still puzzling the engineering designers. Aiming at the lack of three kinds of empirical estimation methods in engineering, a new kind of estimation method is proposed on bearing capacity characteristic values of soil among piles in composite foundation, based on the national and profession standards. Mechanical analysis and derivation are carried out and the correctness of the method is verified with calculation examples. The method is more rigorous than the existing empirical estimation method, and the calculation results are more reasonable and reliable. The method can be used by engineering designers for reference.