Drawing temperature is an important factor affecting the structure of microstructure fibers (MSF) during MSF drawing. According to the Fourier equation of time-dependent heat conduction with, original conditions and boundary conditions of MSF preform, the temperature distribution equation of MSF preform is derived in cylindrical coordinates. It is shown the feeding speed of MSF preform is optimal when the temperature distribution of MSF preform is close to the steady-state heat conduction in high temperature furnace, then the temperature of high temperature furnace can be lowered to the intenerate temperature of MSF preform. In addition, the optimal speed will be increased if the air-filling fraction of MSF preform is high.