Abstract: Considering the complex mechanical characteristics of the h-type double-row pile supporting structure in deep foundation pit engineering, the supporting system is divided into two stages: independent force bearing of the rear piles and cooperative force bearing of the front and rear piles. Based on the theory of vertical elastic foundation beams, differential equations for each stage are constructed, and analytical solutions for displacement and internal force are derived for the entire length. To eliminate the error caused by the initial assumption of small horizontal displacement difference between piles （Δy≈0）, an analytical-numerical iterative coupling optimization method is proposed. The soil pressure correction and displacement field re-solution are implemented through C++ programming. Model tests are conducted based on sandy soil foundation pit engineering, and finite element simulations are performed using MIDAS GTS NX. The calculation results are compared with experimental and simulated values, verifying the feasibility of the calculation model presented in this paper.