This paper uses the finite element to establish the analysis model for double-row piles supporting structure. The model can simulate the contact interaction between the piles and soil, getting the earth pressure behind piles of the front piles and the back piles. Then through the comparison between the contact earth pressure behind piles and the theoretic earth pressure, it obtains the correction coefficient for calculating the earth pressure behind piles.%采用有限元建立双排桩支护结构的分析模型，对桩土接触作用进行模拟，得到前、后排桩的桩后土压力，通过桩后接触土压力与理论土压力比较，得出计算桩后土压力的修正系数。
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