Aerodynamic forces acting on a circular cylinder with splitter plate is experimentally investigated at the range of attack angle between 0° and 180° with an increment of 3° for Re = 20000. In order to show the relation between Strouhal number, lift and drag coefficient and Reynolds number, force measurements are also carried out for the range of Re between 9700 and 36500 at the attack angles of 0°, 45°, 90°, 135°. Lift and drag coefficient is largely independent of Reynolds number changing between 9700 and 36500 for these angles. The results showed that Strouhal number, drag coefficient and lift coefficient is widely independent of Reynolds number.