Abstract: The typhoon Canhong flood control project of Huxi Line slope in Fenghua City, Ningbo City is taken as the research object, the influence of factors such as pile length, pile spacing and pile section on the reinforcement effect of slope is analyzed by establishing a variety of anti-slide pile reinforcement slope finite element model. The theoretical analytical solution of slope safety factor is deduced based on vector sum method, the program of solving slope safety factor by vector sum method is discussed, the influence law of joint plane properties on the stability of jointed slope is analyzed. The results are as follows. The reinforcement effect is better when the anti-slide pile is located in the upper middle position. The longer the pile length, the better the reinforcement effect, but when the pile length increases to a certain length, the improvement of the reinforcement effect is not obvious. The greater the pile spacing, the worse the slope reinforcement effect. The pile section has the most obvious effect on slope reinforcement, with the increase of pile section, the slope safety factor increases obviously. The greater the parameters of cohesion and internal friction Angle, the greater the slope safety factor. The research results can provide reference for the design and construction of similar slope projects.