Objective: In this study, we adopted the method of DD-PCR and RT-PCR to identify and screen the related genes of chordoma and supplied the tartget genes for the research on molecular mechanism, genetic diagnosis and genes therapy of the chordoma. Methods: The method of mRNA-DD was applied to undertake enlargement, purification and sequential analysis for 1 case of chordoma and the straps of differnces in normal paraneoplastic tissues, to identify the related genes of chordoma and to screen 18 cases of chord...