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Numerical investigations on the heat transfer and pressure loss of a plate-fin heat exchanger with V-shaped oblique wavy surface have been conducted. The effects of pointing direction of V shape, oblique angle and wave amplitude are systematically studied to find out the geometry with the best thermal-hydraulic performance. It is found that the oblique wavy surface induces two pairs of counter rotating secondary flows which significantly enhance heat transfer irrespective of the pointing direction of the V shape. Meanwhile, the oblique wavy surface with the V shape pointing downstream shows relatively low pressure loss. It is also found that moderate oblique angle and large amplitude are beneficial for heat transfer augmentation, while oblique angle near 75^o and small amplitude are beneficial for relieving pressure loss. The optimal geometry which balances heat transfer enhancement and pressure loss is …