An experimental study of twin-fluid atomization for powder metallurgy has been conducted using a specially designed atomizer in which liquid is first spread into a thin sheet and then exposed on both sides to high-velocity air. Inner air jet worked for supplying liquid and outer air jets disintegrated liquid sheet. The first result of this study were confined to the effect of atomizing quality through experiments with water. The experimental data will be extend to include the influence of atomizing air velocities on mean particle size through experiments with molten material. An experimental equation on the relationship between SMD and the related parameters was taken out; $$SMD=0.00302frac{{(sigma_L; ho_L;D_L)}^{0.5}}{ ho_A(V_1+1.155;V_2)/2}(1+frac{W_L}{(W_{A1}/3.33)+W_{A2}})+0.0148(frac{{mu_L}^2}{sigma_L; ho_L})^{0.425} ;{D_L}^{0.575}(1+frac{W_L}{(W_{A1}/3.33)+W_{A2}})^2$$.