Objective To investigate the effect of hip arthrography-guided closed reduction on developmental dysplasia of the hip （DDH）. Methods We retrospectively selected 65 children with DDH from February 2018 through February 2020, and assigned 33 cases into the control group with conventional closed reduction treatment and 32 cases into the observation group with hip arthrography-guided closed reduction. Clinical efficacy, hip joint stability, hip joint re-dislocation rate, open reduction rate, and femoral head necrosis were observed in the two groups. Results One year after treatment, the excellent and good recovery rate （93.74%） of the observation group was higher than that of the control group （75.76%, P<0.05）; the anteversion angle of femur and the acetabular index （AI） of the observation group were lower than those of the control group （P<0.05）; the rate of hip re-dislocation, the rate of hip joint open reduction, and the rate of femoral head necrosis （6.25%, 0.00%, and 3.13% respectively） of the observation group were lower than those of the control group （27.27%, 18.18%, and 24.24% respectively） （P<0.05）. Conclusion Closed reduction guided by hip arthrography for the treatment of DDH in children can improve stability of the hip joint and treatment effect, and reduce re-dislocation of the hip joint and open reduction.