In this talk, I will discuss the open string pair production of two D-branes placed parallel at a separation when either or both carry electric plus possible magnetic fluxes in Type II superstring theories. I will also discuss the enhancement of this pair production with the presence of a particular magnetic flux in addition to the applied electric one. However, for the system of D0/Dp, one in general does not expect such a pair production to occur. I will explore the case for which a finite non-vanishing open string pair production rate can indeed be produced when a certain worldvolume flux is applied to the Dp brane.