Abstract: In this paper,an inference model is presented in which the production system co-mbines with the statistical classifying technique to resolve the problem of diagnosingheart diseases based on VCG(Vector Cardiogram).An effective VCG pattern classifieris given.The Hypotheses Deduction method is used as the inference mechanism of theproduction system.The statistical classifier is able to provide the backward reasoningsystem with rational disease hypotheses during operating.