In　order　to　improve　the　capacity　in　the　magnetic　fluid　seal　for　sealing　liquid,　a　kind　of　combined　seal　of　magnetic　fluid　seal　and　mechanical　seal　was　designed.　But　the　performance　of　increasing　saturation　magnetization　and　magnetic　field　strength　was　not　good.　It　mainly　introduced　the　pressure-resistant　capacity　of　combined　seal　of　magnetic　fluid　seal　and　mechanical　seal　in　this　paper　and　verifies　the　pressure-resistant　capacity　of　combined　seal　is　better　than　the　independent　magnetic　fluid　seal　both　in　the　static　seal　and　rotary　seal　for　sealing　liquid.　The　test　indicated　that　this　kind　of　combined　seal　structure　had　certain　practical　value.　It　presented　a　new　type　of　fluid　hydrodynamic　combined　seal　according　to　the　fluid　hydrodynamic　sealing　principle　in　this　paper,　which　would　provide　the　basis　for　the　structure　optimization　on　combined　seal.　©　2017,　Chongqing　Functional　Materials　Periodical　Press　Co.　Ltd.　All　right　reserved.