With MoSi₂-30Al₂O₃ mixed powders as the raw material, MoSi₂-30Al₂O₃ electrothermal coating was sprayed by atmospheric plasma spraying technology. The phase composition, microstructure and thermal stability of the coating were systematically studied by XRD, SEM, electrical test and differential thermal gravity analysis. The results show that MoSi₂-30Al₂O₃ electrothermal coating shows dense microstructure. Al₂O₃ can improve the electrical resistivity and oxidation resistance of MoSi₂ materials in low temperature. The coating exhibits an excellent electrical-heating performance. In the heating cycle test, it could be heated to 320 ℃ stably and exhibit uniform thermal distribution in the surface area. The temperature variation in roll’s central area can be controlled within 25 ℃; Oxidation and thermal stress relaxation during heating cycle would generate cracks and pores in the coating which would increase electrical resistivity.