Abstract: Laser plasma mass spectra oftetraphenylporphlne were recorded on a self-built In－strument． The quaslmolecular catlons and ottrer feature fragments as well as all frag－ments with different non－hygrogen atomes can be observed on the Positive ion mass spectra． The spedes appear on the negative ion mass spectra are not related to the orglnal structure ofsample molecule and are believed to due to the further ion－molecule reactions among fragments． The possible componellts and structures of these ajllonlcspedes as well ss tnelr signlfigance were discussed．