The entry laminar flow and heat transfer over the fin-and-flat tube bank heat exchanger with vortex generators was investigated with numerical analysis in the Reynolds number range of 300—1800. A set of laminar flow predictions were presented to demonstrate the effects of the staggered ratio(Sr) on the local Nusselt number(Nulocal) and the span-averaged Nusselt number(Nub). The correctness of the numerical analysis method was validated by the experimental data and the numerical analysis method could be used to research and develop the heat exchanger with vortex generators.