Lycopodiurn is nearly equal-sized particle that has been recognized as being monodispersed; however it was found that an actual lycopodium dust cloud consisted individual of agglomerated particles.The flame structure of organic dust combustion is composed of three zones:preheat,reaction and post flame zones.In this research,the reaction zone thickness is defined by considering the burning velocity and combustion time τc.It must be said that,some non-dimensional parameters are introduced into the fundamental energy conversation equation in order to simplify the process of solving these correlations.Then,the boundary and matching conditions are taken into account in order to solve the energy equation in all three zones simultaneously.Consequently,the temperature distribution and flame speed are extracted and shown in figures.It can be seen that decreasing the radius to nano-scale causes to raise the flame speed exponentially.