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The pressure assisted ultra-high temperature (PAUHT) system was built with soybean oil as adiabatic medium,and a multiple regression equation of soybean oil temperature change (ΔTP) during pressurization as a function of initial temperature (Ti) and set pressure (P) was developed: ΔTP =-13.45 + 0.46 Ti + 0.0799 P-0.0037 Ti2-2.83 × 10-5 p2.The fitted model indicated that 130 ℃ could be achieved at 700 MPa when the initial temperature of soybean oil was only 90℃ or above.