A new method for the determination of the cancerous cells was proposed. By means of the high resolution of FTIR, the comparison and study on the normal human cells and cells of more than1000 patients suffering from the cervical carcinoma were conducted. It was preliminarily concluded that by this method the obvious difference between the cancer cells and the normal ones can be explained from the molecular level. Moreover, through the interpretation of the spectrum, the main reasons causing the change of the spectrum and the possible mechanism of the cells canceration can be directly explained and thus the course of illness can be forecasted and diagnosing cancer in an early stage can be done.