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Objective：To study the effect of minimal invasion treatment of ostarthritis of acetabular dysplasia of hip with arthroscopy. Method Thirty three cases in 49 hips debrided under the arthroscopy .In this group male 11 and female 22, the left side 9, right side 8 and bilateralis in 16. The procdure which include to remove of osteophyma , loose body and hyperplasia synovial membrane,degenerated cartilage or exposure of subchondral bone on the stress areas of the hip joint , wear and tear of glenoid lip. Result Twenty eight patients were folloed-up average of 23 moneths. After debridement and lavage , most of patients released from pain, restored function and the range of the motion.According to Harris hip joint score evaluation system preoperative were 58.8, postoperative were 89.6.Conclusion Selectivity debridement and lavage were effectived methods for early stage osteoarthritis of acetabular dysplasia , delayed the developing of pathological process.