With　the　evolution　of　cloud　computing　and　virtualization,　the　congestion　control　of　virtual　datacenters　has　become　the　basic　issue　for　multi-tenant　datacenters　transmission.　Regarding　to　the　friendly　conflict　of　heterogeneous　congestion　control　among　multi-tenant,　this　paper　proposes　a　delay-based　virtual　congestion　control,　which　translates　the　multi-tenant　heterogeneous　congestion　control　into　delay-based　feedback　uniformly　by　setting　the　hypervisor　translation　layer,　modifying　three-way　handshake　of　explicit　feedback　and　packet　loss　feedback　and　throttling　receive　window.　The　simulation　results　show　that　the　delay-based　virtual　congestion　control　can　effectively　solve　the　unfairness　of　heterogeneous　feedback　congestion　control　algorithms.