Abstract: Landslides are often the most common and serious secondary disasters induced by earthquakes,and can cause the massive property losses even casualties. Therefore,the stability analysis of slope and the effectiveness of reinforcement measures have become one of the important topics in the field of engineering geology. According to Bainigou landslide in Qiaojia County,the numerical model is created using the two-dimensional finite difference program FLAC and the reinforcement effect of the landslide under different support structures is investigated based on the numerical results. As this landslide belongs to a huge thick bedrock landslide with huge sliding force,three support structures are employed and included double-row anti-slide piles,anchor cable anti-slide piles and anchor cables,and continuous pile-plug structure. The reinforcement effect of three support structures is explored. The computed results show that the double-row anti-slide piles can bear the sliding force,but the sliding force for the double-row anti-slide piles is still relatively large,which can cause that the pile top pushes the surrounding soil downwards. Anchor cable reinforcement can provide the greater anti-sliding force and,reduce the downward slide trend of the slope. Anchor cable with prestressing can effectively restrain the displacement of the pile top and improve the bearing capacity of pile shaft. The inner force distribution using the continuous pile-plug structure is reasonable,and it has better integrity,which plays a beneficial role on anti-sliding. Among the three support structures,the continuous pile-plug structure has the best reinforcement effect.