Abstract: In this paper, seven new type titanate coupling agents of lactic acid have been synthesized, ND-81 has been synthesized by the reaction of the isopropyl titanate with lactic acid and dioctyl pyrophosphate. Stable aqueous solution of its ammonium salt(ND-84) has been made by the reaction of ND-81 with bis(hydrox-yethyl) amine. The Ti-O-Pbond in the titanate compounds containing Phas been identifid by IRspectrum. Anew method of gravimetric analysis has been researched. It may analyse the contents of Ti and Psimultaneously in organic compounds in which Ti and Pcoexist.