We present the dichroic spectra, electroabsorption, wavelength dependence of hole burning efficiency, and intensity dependence of the exciton decay kinetics in the oriented J-aggregates of pseudoisocyanine dye. We propose a new model structure of the J-aggregates. On the low concentration condition the dye molecules form coherent mesoaggregates isotropically distributed. At a high concentration the mesoaggregates start to form incoherently coupled oriented macroaggregates.