Abstract: By means of the technique of microcircuit integrated on DAC, the resistances of graphite like C₃N₄ were in-situ measured under high pressures. At 293 K, the resistance of g-C₃N₄ decreased sharply at 5 GPa and 11 GPa respectively, which was consistent with the calculated result. And at 77 K, the resistance of g-C₃N₄ almost unchanged at 5 GPa, but it changed more sharply at 11 GPa. The rapid decrease of the resistance of g-C₃N₄at 21 GPa maybe indicate an unknown phase transition. 

Key words: graphite like C₃N₄, high pressure, resistance, phase transition