Arthritic psoriasis requires a comprehensive diagnosis based on the characteristics of the skin lesions as well as the arthropathy, and imaging studies. Psoriasis is an immune-mediated, chronic, relapsing, inflammatory, systemic disease induced by a combination of genetic and environmental factors. According to the clinical features of psoriasis, it can be categorized into common type, arthropathic type, pustular type and erythrodermic type, of which common type accounts for more than 90%, and the other types are mostly transformed from common type psoriasis. For arthritic psoriasis, in addition to skin lesions, joint lesions can also appear. Generally speaking, arthritic psoriasis can involve any joints, including the large joints of the elbow and knee, small joints of the fingers and toes, the spine and sacroiliac joints. Joint involvement may show joint swelling, pain, limitation of movement, and in severe cases, joint deformity and progressive development. After X-ray examination, osteoporosis, narrowing of joint cavity and different degrees of joint erosion and soft tissue swelling can be seen. The diagnosis of psoriasis needs to be made in a regular medical institution by a specialized doctor who integrates the medical history, auxiliary examinations and imaging data.