Abstract: In allusion to water bIending emulsion issue of BZ28-2S Heavy Crude Oil in mixed transportation with submarine pipeline, the oil and its emulsion's rheology at different water cut are tested, inversed phase emulsification characteristics of W/O emulsion is evaluated and the inversed phase point of emulsion is considered as a condition parameter.Cause analysis on inversed phase of W/O emulsion is made.The research achievement can be taken as a reference for wafer blending transportation of mixed heavy crude oil.