Firstly，the numerical simulations for the flow-field of typical urban area models are carried out by solving 3-D Navier-Stokes（N-S）equations based on viscous unstructured Cartesian grid. Secondly, the flow-field of typical urban area is measured by using the particle image velocimetry(PIV).Finally, comparisons between testing results and numerical calculation results are conducted to analyze the characteristics of typical urban area flow-field.