Abstract: Zinc hydroxystannate（ZHS） and zinc hydroxystannate coated clay（ZHS/clay） were synthesized by direct precipitation method，then the zinc stannate（ZS） and zinc stannate coated clay（ZS/clay） were prepared by calcination from the precursors.The as-prepared samples were characterized by X-ray diffraction（XRD） and scanning electron microscope（SEM）.Results in- dicated the ZHS synthesized at the room temperature for 4 h had high yields and neat grain size.The ZS had amorphous confi- guration，while the coated product，ZS/clay，had clear coating morphology.Furthermore，the as-prepared ZS/clay was applied as a substitution of Sb2O3 into the PP/DBDPE/Sb2O3 that was a flame-retardant coordinated system.When 50% Sb2O3 was replaced by the ZS/clay，the composite material could pass the V-0 rating in vertical burning tests，and showed a limiting oxygen index（LOI） value of 23.3%，along with a toughness of 13.18 kJ/m2，then this one could approximate the full of Sb2O3 one.

Key words: zinc stannate, coating, clay, Sb2O3, flame retardant