Abstract: A novel flame retardant (M-MFRP) has been synthesized. Firstly we modificatied melamine formaldehyde resin (MF) and then coated red phosphorus(MFRP). Importantly in this way, we can get M-MFRP in order to reduce producing PH3 during processing between M-MFRP with the flame retardant erials. Then we compared PH3 releasing situation of before and after modification cladding red phosphorus. At the same time, we analysised flame retardant properties, mechanical properties, thermal decomposition performance to 10% for drug loadings MFRP ((M-MFRP)-PP.