Porphyrin and its derivatives is one of the research focuses because of its special physical and chemical properties.The solubility of porphyrin and its derivatives would increase after one hydrophlic group for example carboxylic group were introduced.In this paper,mono amino tetraphenylporphyrin was modified by succinic anhydride so that one carboxylic group was introduced into the target porphyrin molecule.The product was characterized by 1H NMR,IR,and UVVIS which was first published.The result of element analysis was in the line with calculation.Moreover,the solubility of 4-oxo-4-((4-(10,15,20-triphenyl 21H,23H-porphin-5-yl) phenyl) amino) botanic acid was reported.