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The blunting line equation is very important in J-integral testing because of its indispensability in the determination of valid data and JIC value. The blunting line equation in current standard has had a larger relative error in depiction of the crack blunting compared to the experimentally measured results. By analyzing the blunting process of the crack tip according to the D - B model, a new form of blunting line was obtained on the base of the path independence of J-integral, i.e. J= 1.25(σs+Sf)/1+n ·WSZ.Experimental results show that this equation is more precise to describe the crack blunting than those in current standards.