Objective:To study the pathogeny,clinical manifestlation,diagnosis and treatment of lumbar hernia. Methods:The clinical data of 9 cases of lumber hernia admitted from January 1997 to January 2007 in the Department of General Surgery Affiliated Changhai Hospital of the Second Military Medical University were analyzed retrospectively. Results:Among 9 cases,1 case was caused by nature. Two cases were caused by traumatic factors and 6 cases were caused by other factors.The clinical manifestation of lumbar hernia included lumbar bump in 9 cases,lumbar pain in 5 cases,nausea and vomiting in 2 cases,gut incarcerated with bowel obstruction in 1 case. The typical sign was a painful flank bulging in the superior or inferior triangle.Seven cases had hernia in superior lumbar triangle;one of them had hernia in both inferior lumbar triangle and superior lumbar triangle.Hernioplasty included by using contiguity tissue and synthetic patch were performed in 8 of all the cases. Conclusion:The diagnosis could be made according to clinical symptoms and signs.Doppler ultrasound examination,CT and MRI scanning are helpful for diagnosing lumbar hernia.Excision of the sac and repairing with surrounding tissue or by prosthetic material may show satisfactory results．