By using a new type of laser measuring instrument, the three-dimensional particle dynamics analyzer (PDA), the characteristics of gas-solid two-phase flows around a single finned tube are measured. The parameters such as slip velocity and turbulent intensity are analyzed. The fluid field and particle movements are also numerically calculated through SIMPLE cells and the two-equation k-epsilon model combined with the FSRT (fluctuation spectrum random trajectory) model of turbulence to simulate the turbulent fluid phase. The experimental and numerical calculation results are essentially identical. The results are very useful in guiding the design and structure optimization of gas-solid inertial separators with enhanced heat transfer unit finned tubes.