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Abstract The diagnosis of ECG is one of the basic skills of clinician.But now，clinician are lack of this kind of ability. ECG core theory as the theory of"secondary projection"，namely different moments of ECG integrated vector space vector ring successively through two-dimensional projection plane and one dimensional linear space form ECG theory.This article will be to the ECG vector theory in the teaching of ECG positioning for analysis，the importance of cardiac vectors in ECG education is analyzed，and how to use in the ECG teaching and strengthen the theory，for improving the teaching effectiveness of ECG.
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