The present disclosure provides a medical data analysis method and device. The method comprises locating a semantic subspace of the subject in a medical data set by taking the physical parameter as a feature; and analyzing the probability P1 of the subject being in the semantic subspace that the subject belongs to by judging the semantic consistency of the semantic subspace where the physical parameter of the subject exists. In addition, it is also possible to analyze the probability P2 of the subject being in the node that the subject belongs to based on the evidence transference score of the physical parameter of the subject on the medical knowledge graph. P=α×P1+(1−α)×P2 The probability P of the subject being in the semantic subspace or node that the subject belongs to can be determined by P=α×P1+(1−α)×P2, wherein α is a reconciling parameter, 0