The effects of sintering atmospheres(vacuum,N2,Ar)on the chemical composition,saturation intensity and coercive force were studied by using X-ray diffraction,electrons back scattered images,Co-% magnetism meter and coercive force meter for the Ti(CN)base ceramets.The test results indicated that the total amount of the C,N,O and the saturation intensity were increased,but the lattice constant of binder phase was decreased in the corresponding alloy after the green compacts of Ti(CN)base ceramets were sintered in Ar,vacuum,N2,respectively.It caused a non-uniform construction if sintering in Ar and N2;even more influence in N2,resulting in a disorder coercive force.The values of Co-% magnetism and coercive force could be used as a criterion of the change of chemical composition and structure.