A case of juvenile psoriatic arthritis in a 12 year-old boy was reported. The patient had a history of one and half a year of bilateral heel pain, followed by pain in the right knee and ankle and right hip joint. He developed psoriatic lesions affecting his nails and skin. He had increased erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) contents. Human leukocyte antigen (HLA) B27 was detected but serum rheumatoid factor was not in the patient. A skin biopsy revealed psoriasis and ultrasonography demonstrated synovitis in right knee and ankle. Juvenile psoriatic arthritis was diagnosed based on his physical, laboratory and skin biopsy findings. A treatment with nonsteroidal anti-inflammatory drugs and sulfasalazine produced no effect. Leflunomide in conjunction with anti-TNF biologic agents (Etanercept) was administered, followed by symptomatic improvement 2 weeks later.［Chin J Contemp Pediatr, 2007, 9 (4):339-342］