[en] A series of novel 5-Aryl-3-(3-coumarinyl)-1-benzothiazolyl-2-pyrazolines have been synthesized by the reaction of 3-coumarinyl chalcones with 2-hydrazinobenzothiazole in hot ethanol. And the structures of these new compounds have been characterized by 1HNMR, MS and elemental analysis. The fluorescence spectra of these compounds were also measured. All the compounds showed up strong green light emissions (lembda em: 557-570nm). The results showed that the absorption maxima of the compound vary from 415 to 420nm depending on the group bonded to pyrazolines rings. (author)