Toprovidetheoreticalbasisforeffectandmechanismofpercutaneouslumbardiscectomyinclinic.Methods:Atotalof180patientswithlumbarintervertebraldischerniationwereevaluatedbyCTonthefifthdaybeforeandafteroperation.Meanwhile,CTvaluewasmeasuredinthedeterminedlevelandregion.Results:Afteroperation,CTvalueofthecentralandposteriordeterminedpointofherniatedintervertebraldiscwaslowersignificantlythanthatbeforeoperation(P<0.01),butCTvalueoftheanteriordeterminedpointwasdifferentinsignificantly.Theexcellentandgoodresultsofthepatientstogetherwere83%postoperatively.Conclusions:Thecurativeeffectofpercutaneouslumbardiscectomyisachievedthroughreductionoflumbarintradiscalpressure.