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Problems caused by the accident aircraft propulsion device prone to failure for unmanned aircraft, proposed ARM-based microcontrollers to build unmanned aircraft flight control platform independent power failure detection systems, introduces the composition and overall structure of the system design, the study achieved LPC2148 ARM microcontroller hardware connection circuit, PWM signal generating circuit, A / D sampling circuit and preamplifier circuit, etc.; hardware platform for system startup code and other system-level software design for autonomous detection algorithm is studied, the establishment of a boot environment system. Flight control system for the tests and the debugging and testing through the serial port of PC software, set the serial port to C0M1,0 baud rate, parity for NONE, bits of 8, stop bit is 1, send and receive are hexadecimal, the experimental results show that autouomous system for unmanned aircraft fault detection accuracy and stability are greatly improved.