The effects of various process parameters for the high pressure epoxidation of soyabean oil have been studied. It was observed that high epoxy yield up to 80% can be obtained by optimizing the process parameters like temperature, pressure etc. Pressure was found to have significant effect on epoxy yield. Epoxy yield increase linearly with pressure and becomes constant at about 20 MPa. Optimum temperature was found to be 100degreesC above which the epoxy yield decreases. FTIR spectroscopic analysis indicates ring opening side reaction at higher temperature. It was also found that the epoxy yield decreases when oil to CHP ratio reduced beyond 10.