It has been studied absorption spectra and The fluorescence for Coumarin Dye (C-2) as mixture in polar solvent with different concentrations and in addition to poly Methyl Metha Acrylate (PMMA) as a thin film with concentrations ( 2x10-5, 6x10-5, 1x10-4)M at room temperature ,and the quantum efficiency of this films for each concentration has been calculated to be ( 65. 7 , 70.1 , 75.3 ) % respectively.Also ,the absorption and fluorescence spectra of the polymer mixed with different concentrations of dye C2 has been studied