The present research has systematic approach to synthesized a series of 1-(4-Phenyl Thiazole-2- yl)-3,5- disubstituted Pyrazolines (3a-h) derivatives by the action of substituted 1,3-diaryl-prop-2-ene-1-one (2a-h ) with 4-phenyl-2-hydrazino thiazole. Structures of all the synthesized compounds were confirmed by their IR, 1H-NMR and elemental analysis.