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To improve the temperature stability of PMN(Pb(Mg1/3Nb2/3)O3)-based ceramics, PMN-based composite ceramics were prepared by co-sintering method of two kinds of ceramics with different curie temperature. One unit is MHT(0.82PMN (Pb(Mg1/3Nb2/3)O3)-0.18PT(PbTiO3)(the curie temperature Tm=74°C)), and the other unit is MLT(0.88PMN(Pb(Mg1/3Nb2/3)O3)-0.12BT(BaTiO3)(the curie temperature Tm=-50°C)). The effects of sintering temperature and the ratio of high and low Tm units on dielectric temperature stability were studied. The results show that the temperature stability can be improved greatly by co-sintering and coating method and PMN(Pb(Mg1/3Nb2/3)O3)-based composite ceramics are promising candidate for practical applications.