The examination of diseases is supposed to be some necessary skills for doctors, but as a patient, one must also know how one’s disease is judged. Among the judgment paragraph is not wrong, they should know their own health situation. Now some healthy people, should also know some of the signs and symptoms of the disease examination, in order to early detection, early treatment. Ankylosing crestitis can be confirmed by the following methods of examination: physical examination, sacroiliac arthritis is one of the main manifestations of ankylosing crestitis, the presence or absence of sacroiliac arthritis can be initially determined through physical examination. (1) direct pressure on the sacroiliac joint: the patient lies prone, the examiner’s hands directly press the sacral area equivalent to the sacroiliac joint, the patient often feels local pain when there is inflammation; “4” test: (2) the patient lies supine, one leg is straight, the other leg is bent at the knee and the foot is placed on the opposite thigh. (3) pelvic squeeze test: the patient lies on his back, the examiner presses his iliac crest with both hands, if the patient feels pain in the buttocks, it also suggests sacroiliac joint pathology; (4) iliac crest push test: the other patient lies on his back, the examiner puts both hands on his iliac crest, the thumb is placed at the anterior superior iliac spine, and then pushes the pelvis, the sacroiliac joint Local pain indicates sacroiliac arthritis. Imaging examinations can be performed to detect sacroiliac arthritis, crestal and peripheral joint lesions. Plain radiographs are the most practical means. The typical presentation of sacroiliac arthritis is a blurred joint surface with small capsular changes and jagged joint edges. The later stage shows narrowing of the joint space or even its disappearance and fusion. The crestal lesions tend to start from below and progress upward. Early manifestations are generalized osteoporosis, straightening of the lumbar spine due to loss of normal anterior convexity curvature, and compression fractures of the vertebral body may occur. As the disease progresses, the vertebral body becomes square, bony bridges are formed, and the crest shows characteristic “bamboo-like” changes. CT and MRI examinations are helpful in detecting very early lesions, but asymptomatic sacroiliac arthritis on CT images alone should be alerted to AS, and the results of radionuclide scans are for reference only.