A　simplified　steady　model　of　air　flow　diffusion　and　chemical　reaction　in　loose　coal　is　solved　numerically　and　distribution　of　oxygen　volume　fraction　and　flow　velocity　magnitude　is　obtained　in　present　study.　The　simulating　results　of　oxygen　volume　fraction　and　velocity　magnitude　distribution　is　compared　with　critic　value　as　well　as　duration　of　self-ignition　of　coal　spontaneous　combustion　from　experiment　to　partition　＂three　zones＂;　mining　conditions　to　avoid　spontaneous　combustion　are　also　obtained.　The　method　is　employed　to　predict　spontaneous　combustion　in　multi-layer　mining　workface　in　Dongrong　No.2　coalmine　successfully.　The　result　showed　that　self-heating　zone　lies　in　50-140　m　in　the　airflow　inlet　side　and　in　50-85　m　in　outlet　side　away　from　the　workface　in　the　coal　pillar.　If　moving　velocity　of　the　workface　is　larger　than　1.6　m/d,　there　is　no　danger　of　spontaneous　combustion;　while　if　the　workface　stopped　to　move　but　ventilation　kept　normal　for　38　days,　spontaneous　combustion　will　take　place　in　airflow　inlet　side　of　the　pillar.　Compared　with　predicting　spontaneous　combustion　by　numeric　modeling　the　whole　process　of　coal　spontaneous　combustion,　much　smaller　amount　of　calculation　is　required　and　precision　can　satisfy　the　demand　of　extinguishing　and　preventing　spontaneous　combustion　by　the　given　method.