Abstract: It is very important to evaluate cardiovascular function and analyze the parameter indexes of blood flow in the matter of either the prediction of cardiovascular function or the diagnoses of cardiovascular diseases.In this paper,a method is introduced.It consists of the following proceedings.the clustering through the weighting of the main elements at first,then classifying the samples using fuzzy ISODATA,and modifying the division matrix again and again until an optimal classificaion comes out,which followed by taking the cluster center as the standard model to establish a subordinate function,and finally,using it to judge other samples.In fact,150 samples,12 items of each person are caclulated in this paper,the predictions for 50 other samples are made,which are quite satisfactory.