Abstract: Abstract Objective: To explore the clinical diagnosis and treatment in patients with idiopathic normal pressure hydrocephalus (iNPH). Methods: Clinical data of 35 patients with iNPH in our department from September 2008 to June 2010 were analyzed, the symptoms before and after operation have been compared. Results: Among 35 iNPH patients have been operated by ventriculoperitoneal shunt, all of them have improved in clinical symptoms in varying degrees. gait disturbance(85.7%), dementia(91.4%), urinary incontinence(82.4%). 13 patients have improved in all symptoms, the remains have one symptom improved at least. Conclusion: iNPH is one of the common diseases in neurology which can be misdiagnosis and missed diagnosis. Ventriculoperitoneal shunt is effective method for it. Lumbar puncture and tap test can be used to select patients for operation.

Key words: idiopathic normal pressure hydrocephalus, ventriculoperitoneal shunt, dementia, gait disturbance, Tap test