High　precision　models　were　established　to　investigate　airflow　pattern　and　lubrication　performance　inside　bearing　cavity　with　different　oil-air　supply　methods.　The　coupling　technique　of　Level-Set　function　and　VOF　method　was　used　to　track　the　oil-air　interface,　and　the　migration　and　diffusion　process　of　oil　droplets　inside　bearing　cavity　were　obtained.　A　high-speed　oil-air　lubrication　test　rig　was　designed　and　set　up,　bearing　temperature　rise　with　outer　ring　and　lateral　oil-air　lubrication　methods　at　different　rotation　speeds　were　tested　and　compared.　Finally,　combined　with　the　internal　flow　and　temperature　field　distribution,　the　synergistic　analysis　was　applied　and　the　lubricant　flow　and　heat　dissipation　performance　of　bearing　internal　cavity　and　key　areas　were　all　estimated.　©　2020　Elsevier　Ltd