This article aimed appraising 7 nontraumatic leads which can better manifest P waves by analysing the size of P waves in 32 normal subjects.The difference ofthe leadswas highly significant(P1E-10)The P waves were botter shown in CL(chest-limb)lead,HC(head chest)lead andABC-A lead,in which the difference was insignfficnt(P>0.05)than in Ⅱlead and S5 lead.The CL lead and HC lead were of equal value.So they can be replaced each other.But the CL lead and ABC-A lead were of unequal value(△=30 μV).So they can make up each othor.The A lead and MCL. lead Were pocrly manifested The CL lead can manifest the P wave better,the wave form is steady,the installation is simple,and it is easily operated and popularlzed.