Biomedical　Question　Answering　aims　to　extract　an　answer　to　the　given　question　from　a　biomedical　context.　Due　to　the　strong　professionalism　of　specific　domain,　it＇s　more　difficult　to　build　large-scale　datasets　for　specific　domain　question　answering.　Existing　methods　are　limited　by　the　lack　of　training　data,　and　the　performance　is　not　as　good　as　in　open-domain　settings.　We　propose　a　model　weighting　strategy　for　the　final　answer　prediction　in　biomedical　domain,　which　combines　the　advantage　of　two　models,　open-domain　model　QANet　and　BioBERT　pretrained　in　biomedical　domain　data.　Especially,　we　adopt　effective　data　augmentation　strategies　to　improve　the　model　performance,　including　round-trip　translation　and　summarization.　The　public　biomedical　dataset　collected　from　PubMed　provided　by　BioASQ　is　used　to　evaluate　our　approach.　The　results　show　that　the　model　performance　has　been　improved　significantly　on　BioASQ　6B,　7B　and　8B　datasets　compared　to　the　single　model.　©　2021　IEEE.