When the traditional double row piles are used in the high filling engineering, the front row piles and the back row piles cannot be combined as soon as possible to form a whole, which leads to the pile in cantilever state at a certain height of earth filling, and inevitably leads to a great difference between the force characteristics of double row piles in excavation engineering. In order to improve the overall rigidity of double row piles in filling engineering, it is suggested to add connecting beams at the waist of double row piles. Based on the numerical analysis, it is shown that the horizontal displacement of filling and pile body in filling engineering is greatly reduced after adding connecting beams at the waist of double row piles, and the bending moment of front row piles, rear row piles and top connecting beams above the waist connecting beams is reduced more than 75.0%. So the configuration of double row piles in filling engineering could be further optimization designed, such as the height of the front pile above the ground is only half of the height of the back pile, and coupling beam are set between the crown beam of the front pile and the waist beam of the back pile. The analysis shows that the horizontal displacement of fill and the control internal force of pile body of the optimized double row pile design are smaller than the corresponding value of the traditional double row pile design in filling engineering, which shows that the optimized design is reasonable and feasible, with the advantages of large lateral displacement stiffness and low cost.