The interlocking pile has been widely used in deep foundation pit engineering， and accidents of support piles invasion often occur due to factors such as geological conditions， construction organization， and operational ability. This article uses a fiber model finite element calculation program to calculate the bending bearing capacity of support piles before and after the invasion treatment. At the same time， combined with the back analysis results of the deep horizontal displacement monitoring of the pile， it is demonstrated that the use of adhesive steel reinforcement method to treat the invasion support piles is feasible. Using the spatial effect of the foundation pit， the step-by-step pile jumping construction is used to cut and reinforce the invasion support piles， and the foundation pit is in a safe and stable state. Analysis of the monitoring results after reinforcement treatment and bending condition of pile body shows that the bending moment value borne by the section is less than the bending bearing capacity of the section.The reinforcement construction of this project has achieved good results， effectively solving the invasion limit problem of the support piles in foundation pits， which can provide reference for similar projects.