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To achieve more stringent exhaust emission regulations will face more and more daunting challenges nowadays. It needs more new technologies to improve the IC engine performance but needing higher costs in order to meet Euro 6 and EPA standards in USA. Recently the opposed-piston engine (OPE) has been treated as the promising product to meet these new regulations but relatively lower costing. Although two-stroke OPE owning inherent thermal efficiency and power density advantages, the inefficient scavenge efficiency appears to become the main obstacle to enhance combustion efficiency whilst reducing exhaust gas emission. For the improvement of scavenge efficiency the transient gas exchange simulation was carried out for multiple Cases here, including two intake port configurations at various back pressures in exhaust system and two port timings.