Five new 5-aryl-3-(4-methylcoumarin-3-yl)-l-(4-nitrophenyl)-3-pyrazolines have been synthesized by reaction of 3-aryl-1-(4'-methylcoumarin-3'-yl)-prop-2-enones with p-nitrophenylhydrazine. The purity and structure of the obtained products have been confimed by thin layer chromatography, IR, 1H NMR, 13C NMR, HSQC and HMBC spectra.