Abstract: The preparation method of Tertrasulphonated Copper Phthalocyanine (CuTsPc) L-B films was investigated, and their structure was studied by Uitra-Visible Spectrum. It was found that CuTsPc L-B films only can be prepared by colomubicelectrostatic interaction because the (CuTsPc) molecule is a long non-dimorphic chain molecule with a special planar structure. Experiments show that CuTsPc molecules in L-B films exist by dimer and lie parallel to the glass substrate plane.