A　three-dimension　geometry　model　of　T-bifurcation　vessel　is　established　so　that　injection　thrombus　dissolution　is　numerically　simulated　by　using　computational　fluid　dynamics.　The　usage　of　medicine　in　the　branch　vessel　(object　vessel)　is　compared　and　analyzed　to　find　the　appropriate　injection　position　and　velocity.　Finally　the　appropriate　range　of　injection　position　and　velocity　are　required.　The　research　provides　numerical　statistics　and　reference　for　further　study　and　clinical　practice　of　interventional　therapy.