Abstract：The 20 L spherical vessel was used in explosion experiment of spherical titanium powder of five different particle sizes. The research selected the sensitive value data of spray pressure p and turbulent flow index t_v, and then fitted the function of tendency of maximum explosion pressure p_max and maximum explosion index K_max influenced by titanium particle size and concentration, and then fitted the function of tendency of the sensitivity concentration of P_max and K_max and lower explosive limitρ_lim influenced by titanium particle size. The results show that the sensitivity concentration and sensitivity turbulence index of K_max are equal or higher than those of P_max. As particle size increases, P_max decreases in the form of quadratic function, while P_max decrease in the form of exponential function, and the sensitivity concentration and LEL of P_max and K_max increase in the form of linear function. As the concentration of titanium powder increase, P_max and K_max increase at first, and then decrease in the form of quadratic function

Keywords：titanium powder; explosive intensity parameters; particle size; spray pressure; turbulence index