Abstract: Two kinds of PTCR materials with different chemical homogeneity prepared respectively by the liquid and solid phase processes were investigated in this paper. The results pointed out that PTCR(L) material showed sharper ferroelectric-paraelectric transition and higher resistance-temperature coefficient than that of PTCR(S) materials. The relationship between chemical homogeneity and resistance temperature coefficient was presented and discussed in detail As the result, we come to conclusion that chemical homogeneity of PTCR materials played an important role on the temperature coefficient.