Principal components analysis(PCA) is used as a recognition method for investigation of three different leukemic cells.The background noises in oringinal data are erased by fifth powers fitting and three point smoothing.The PCA has been used to extract feature vectors and for cluster analysis after dimension reduction,then three leukemic cell lines are clustered separately.The results show that the Raman data between HL60 cell and CA46 cell are near,but is far away from Jurcat cell.It indicates that HL60 ce...