Inclined pile can improve the ability of bearing horizontal load of pile body, effectively control the lateral displacement of pile body and supporting structure, and long short pile retaining structure can reduce the engineering cost. Based on this, this paper puts forward the inclined long short composite pile, studies the deformation and stress characteristics of the inclined long short composite pile through model test and numerical analysis, and draws the following conclusions: the effect of increasing the inclination angle on the improvement of the supporting capacity is more significant than reducing the pile length of some rows of piles on the weakening of the supporting capacity; the supporting effect of the inclined long short composite pile is related to the distribution of pile length, but the former is more significant When the total pile length is fixed and the short pile meets a certain embedded depth, there is a critical value of the inclination angle. When the inclination angle is less than the critical value, the optimal distribution of pile length is affected by the inclination angle. When the inclination angle is greater than the critical value, the longer the inclined pile, the better the supporting effect The better.