To improve the stability and service life of IrO2-SnO2 coating, the iridium complex and tin complex containing acetate radical were synthesized by addition, and the Ir-Sn oxide coatings were prepared by thermal decomposition method. The surface morphology, composition distribution and phase structure of IrO2-SnO2 coatings were analyzed via scanning electron microscopy, electron microprobe and X-ray diffraction, respectively. The effect of oxidation temperature on stability of IrO2-SnO2 coating prepared by complex in acidic solution containing fluorine was studied through accelerated electrolysis, and comparative study of two coatings prepared by chloride and complex was made. Based on experiments, the thermal oxidation temperature had significant effect on surface morphology and phase composition. The compact coatings were prepared at 480-520 ℃. With the increase of temperature, the stability of IrO2-SnO2 coatings increased, yet it decreased as the temperature was higher than 520 ℃. The accelerated life of oxide coating prepared at 520 ℃ was 520 h in 1.0 mol/L H2SO4 solution containing 20 m/L F-. In a word, IrO2-SnO2 coatings prepared by complex, may effectively improve the microstructure and composition distribution of the coating, remarkably improve the stability of the coating, and prolong the service life of the coating in acidic solution containing trace fluorine elements.