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According to the structural characteristics and working principle of spherical microminiature aircraft,a flight control system based on ARM Cortex-M3 STM32F103RBT6 microcontroller was designed,the functional design and performance analysis of main module were completed,components selection principles and research conclusions were given,and two-axis rotary table experiment of attitude sensor and aircraft indoor flight test were carried out. The results showed the flight control system attitude sensor could provide attitude reference information to flight control due to its high measurement accuracy,and that the aircraft could perform hovering flight and low-altitude maneuvering successfully with stable flight attitude. The flight control system can meets the requirement of the spherical microminiature aircraft flight control well,and it has certain practicability and extensibility.