Abstract: Using FR-PN-G,a synergistic flame retardant,to treat the jute/polypropylene fiber needle felt,and optimized the concentration of flame retardant,dipping time,dip pressing times by using orthogonal test.The optimum processing parameters were determined: concentration of flame retardant is(450 g/L,) dipping time is(20 min,) dip pressing times is 2.The flame retardant finishing of the jute/polypropylene fiber needle felt was performed by using these processing parameters,and as showed in the following test results that the best overall flame retardant effect has been achieved: its LOI is 35.2%,char length is(40 mm,)after flame time is(0 min),afterglow time is(0 min,)tensile strength is (24.95 MPa,) and bending strength is(30.27 MPa.)