Abstract: The paper dealed with the application of a self-prepared water insoluble flame retrardant diethyl-2-(methacryloyloxyethyl)phosphate(DEMEP) onto silk fabric. Emulsification of DEMEP, the stability and the size distribtion of the DEMEP emulsion were investigated. Adding 10% ~15%(Mass percentage of DEMEP) mixture emulsifier contained Tween 80 and Span 80 at the mass ratio of 2 to 1 can acquire translucent emulsion with good thermal and quiescence stability. DEMEP emulsion was applied to be grafted onto silk fabric, the removal of DEMEP homopolymer on silk fabric with different solvents were explored, and the result showed that acetone and methanol are good solvens for DEMEP homopolymer after 4 to 6 h treatment. The whiteness and permeability of DEMEP grafted silk fabric decreased with increasing graft yield. Micro-scale combustion calorimetry tested combustion behaviour of DEMEP treated silk fabric at milligram level, and the result showed that the heat release rate and total heat release have significant decrease compared with control silk fabric. The test results showed after treated with DEMEP, silk fabric can acquire good flame retardancy property.