Objective To evaluate diagnostic value of hip joint involvement in ankylosing spondylitis by ultrasound score. Methods 86 cases of ankylosing spondylitis patients with hip joint involvement were scored according to the different ultrasound findings of the hip joint capsule and enthesopathy of greater trochanter tendon. The correlation among ultrasound of hip joint and clinical and laboratory indexes were analyzed，and evaluate the feasibility of ultrasound scores in diagnosing hip pain with patients. Results ①The history of hip pain was the highest correlation with cartilage damage (r＝0.509, P＜0.01)；Internal and external rotation were the highest correlation with intra-synovial Doppler signal(r＝0.550，P＜0.01), the low correlation with synovial hypertrophy and capsule effusion(r＝0.416、0.336，P＜0.01), and the greater trochanter tenderness was lowly correlated with enthesial blood flow signal (r＝0.475，P＜0.01);②VAS and ASDAS-CRP were significantly correlated with hip joint capsule and overall ultrasound scores (r=0.784, 0.624, P＜0.01). Conclusion. The hip joint capsule score has the highest correlation with clinical scores and laboratory indicators in the ultrasound scores, and can be used to patients with hip joint involvement to a certain extent. The intra-synovial blood flow is the most indicative of disease activity in the ultrasound scores.