Most of the engineering geological environments near the foundation pit of urban buildings are complex with narrow construction space. The general supporting methods, such as pile-anchor structure, can not be used because of the influence of the existed piles of the around buildings. It is more difficult for the construction when low shear strength of foundation pit slope soil layer and long embedded length of the supporting pile are encountered. Combined with a comprehensive design in Xingtai City, this paper presents a foundation pit support project with double-row piles + water-proof curtain between piles + foundation reinforcement. Double-row piles can increase the slope stiffness, water-proof curtain between piles can save the construction space and is helpful to solve construction space restriction, improve the shear strength of the foundation and shorten the length of supporting piles.