Abstract: This paper discusses the soil nail's axis force of the pile-anchor composite soil-nailed wall in a deep foundation pit.Fast Lagrangian analysis of continua (FLAC) is used to analyze the interior force in soil nails.Results of the numerical analysis show that the interior force of soil nails in the composite soil-nailed wall is slightly less than that in the soil-nailed wall and the change law of the interior force is the same as that of the soil-nailed wall.These results are very close to the in-situ measurements.Furthermore,a comparison of slip surface between the composite soil-nailed wall and the traditional methods is made,and there are some differences between them.The measurements show that FLAC can be used to analyze the interior force in soil nails.