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The purpose of this work is to develop a rollover prevention system with Unified Chassis Control (UCC) which consists of CDC (Continuous Damping Control) and ESP (Electronic Stability Program). Although CDC system contains anti-roll control logic to reduce roll angle, it is insufficient to prevent rollover. ROP (RollOver Prevention) control logic of CDC enhances rollover prevention by controlling damping force distribution to each damper when impending rollover is detected. ESP system also needs the additional control logic for rollover prevention since it is ultimately developed to enhance the stability of a vehicle by controlling its yaw characteristic. UCC system modifies rollover prevention control logic of each system by sharing sensor information. In this study, the rollover prevention effect of UCC system is investigated by simulation and vehicle tests.