Indoor　formaldehyde　pollution　did　a　lot　of　harm　to　our　health.　Aimed　to　control　indoor　formaldehyde　pollution　effectively,　at　the　first,　the　qualities　and　sources,　hazards,　factors　that　influenced　the　indoor　formaldehyde　concentration　especially　the　temperature　and　humidity,　were　introduced　in　this　paper.　The　results　in　relative　papers　showed　that　the　indoor　formaldehyde　concentration　increased　with　the　increasing　of　the　temperature　and　humidity.　After　these　academic　results　were　listed,　the　indoor　formaldehyde＇s　data　in　Beijing　in　2005　were　analyzed.　Those　data　were　gained　from　Indoor　Environment　Testing　Center　of　Beijing　University　of　Technology.　For　making　out　those　relations　among　the　temperature,　humidity　and　the　indoor　formaldehyde　concentration,　the　lineal　coefficients　among　the　mean　temperature,　the　mean　the　month　mean　humidity　and　formaldehyde　concentration　were　calculated.　In　the　mean　time,　for　explaining　those　relations　more　complete,　the　lineal　coefficients　among　the　mean　temperature,　the　mean　humidity　and　the　percent　of　up-standard　samples　were　calculated.　The　results　indicated　the　temperature＇s　influence　more　than　the　humidity　on　the　month　mean　formaldehyde　concentration　and　the　percent　of　up-standard　samples　in　each　month.　Then　based　on　the　different　characteristics　of　indoor　formaldehyde　pollution　in　the　decorating　and　decorated　houses,　different　methods　to　control　indoor　formaldehyde　pollution　were　introduced　respectively.