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A catalyst-,acid-and base-free,environmental-friendly method for synthesis of 2H-benzo[g]furo[2,3-e]indazoles,2H-benzo[g]-thieno[2,3-e]indazoles and 2H-benzo[g]pyrrolo[2,3-e]indazoles via UV light irradiation of 3-phenyl-4-(2-heteroaryl)pyrazoles(aryl=furanyl,thiophenyl and N-methylpyrrolyl)in EtOH/H20 at room temperature under argon atmosphere was described.