Abstract: It is a key factor to increase heat transfer coefficient of high viscosity fluid in the shell side for making a high performance cooler.The heat transfer and flow resistance performance of trapezoid fin tube high viscosity fluid cooler with helical or segmental baffles were studied, and compared with the heat transfer coefficient of low-fin-tube cooler with segmental baffles. Experimental results indicated that heat transfer film coefficient in the shell side of trapezoid fin tube cooler with entire helical baffles was 60% more higher than that of low-fin-tube cooler with segmental baffles，and pressure drop was lower by 40%. Heat transfer film coefficient in the shell side of trapezoid fin tube cooler with entire helical baffles was 20% more higher than that of trapezoid-fin tube cooler with segmental baffles, and pressure drop was lower by 50%.Heat transfer film coefficient in the shell side of trapezoid fin tube cooler with entire helical baffles was 10% higher than that of trapezoid fin tube cooler with sectional helical baffles, and pressure drop was lower by 19%.Heat transfer film coefficient in the shell side of trapezoid fin tube cooler with segmental baffles was 30% more higher than that of low-fin-tube cooler with segmental baffles, and pressure drop remained unchanged.