Abstract: The flameretardant polyurethane (TPU) compounds were prepared by using triazine charringfoaming agent (CFA) and ammonium polyphosphate (APP) as intumescent flame retardants (IFR) and magnesium silicate (MgSiO3) as a synergistic flame retardant. The flame retardant performance, mechanical properties, thermal decomposition behaviors and morphologies of the char layers were investigated. The results indicated that the limiting oxygen index of pure TPU was only 22.0 vol %, leading to flammability in the air. The flameretardant TPU compounds achieved an limiting oxygen index of 37.1 vol % with the addition of 28 wt % IFR and 5 wt % MgSiO3, and they also reached a V-0 rating according to the UL 94 classification. However, their tensile strength and elongation at break decreased significantly due to the incorporation of these flame retardants. TGA results indicated that the thermal decomposition temperature and maximum thermal degradation rate of flameretardant TPU compounds were reduced with the addition of flame retardants, but the residual char content was improved significantly.