This study selected the subgrade landslide area from K103+740 to K103+790 of Line S218 as a case to deeply discuss its unique terrain characteristics and the causes of problems in this section,and evaluate and evaluate its stability.On this basis,an improved design strategy is proposed,emphasizing the key quality management measures that should be paid attention to during the implementation process,and ensuring that the problem of subgrade slopes is handled in accordance with the design standards,thereby improving the safety and comfort of the entire subgrade slopes and giving the public a safer access experience.