1,4-Butane-sultone functionalized graphitic carbon nitride (g-C₃N₄@Bu-SO₃H) was prepared and applied as an efficient heterogeneous catalyst for the synthesis of various quinazoline derivatives with high yield. In next step, the structure and morphology of catalyst was characterized by different analyses such as, FT-IR, EDS, XRD and FE-SEM. On the other side, considering the noticeable features of g-C₃N₄@Bu-SO₃H such as high stability, easy to synthesize, non-toxicity, excellent reusability, and so on, the synthesis of quinazolines derivatives with numerous advantages such as short reaction time, mild reaction condition, and easy separation were realized.