Thermochronic VO2(M)powders are successfully synthesized through hydrolyzing the vanadyl sulfate and the following two-step calcination.The physical-chemical and phase transformation performance of the ultimate products are characterized by DSC,XRD,SEM,EDS,FTIR and nanoparticle size analyzer.VO2(M)is coated on cotton/polyester fabrics with water borne polyurethane,and the emissivity of the coated fabrics is measured in 8~14 μm wavelength range.The results show that the morphology of VO2 is changed during the process from B to M phase.The VO2 from B to M phase happens to the semiconductor-to-metal phase transformation in the process of heating.There is a fall of up to 15% in infrared transmissivity,and when wet coating thickness is 150 μm and grain size is 156 nm,the compound coating gains the optimum thermochromic-emissivity,the drop in emissivity reached 15%.It can effectively protect military target as the emissivity changes.