Objective To observe the effect of continuous lumbar cisterna drainage in the treatment of hydrocephalus caused by aneurysmal subarachnoid hemorrhage. Methods A total of 88 patients with aneurysmal subarachnoid hemorrhage(SAH) from May 2013 to April 2015 in our hospital were taken as the clinical research objects, and they were divided into observation group (44 cases) and control group (44 cases) randomly. Patients in the control group were given lumbar puncture drainage, the other patients in the observation group were given continuous lumbar cisterna drainage. The cerebral blood flow velocity (Vm),visual analogue pain scale (VAS) and Glasgow score (GOS) before and after treatment were recorded, the postoperative complications as hydrocephalus and cerebral vasospasm were observed, and the total effective rates in the two groups were compared. Results The total effective rate in the observation group was 81.82% which was significantly higher than that in the control group 61.36%(P<0.05). The Vm and VAS in the observationgroup were respectively (129.35±1.74)cm/s and (3.26±1.29) which were lower than those in the control group(P<0.05). The GOS in the observation group was (4.39±0.14) which was significantly higher than that in the control group (P<0.05). The incidence rates of postoperative hydrocephalus and cerebral vasospasm in the observation group were respectively 9.09% and 15.91% which were lower than those in the control group 27.27% and 36.36%(P<0.05). Conclusion Continuous lumbar cisterna drainage, has better effect in the treatment of aneurysmal subarachnoid hemorrhage, and can effectively prevent hydrocephalus and other complications. Thus, it is worthy of clinical application.