the present invention relates to an airbag door for instrument panel and its manufacturing method . a passenger side airbag door for instrument panel includes a substrate with airbag opening , skin layer and foam layer , a pab door reinforcement board which covers the airbag opening is connected to the instrument panel substrate . this pab door reinforcement board is a cellulosic composite material board which is soaked by thermoplastic plastic or thermoplastic elastomer , formed through thermoforming . in present invention , the turnover and movable portion of the airbag door is lighten greatly . the airbag door with the light composite material can prevent the windshields from being broken effectively when the airbag deploys sufficiently and impacts against the windshields .