The flight control system is one of the core of small unmanned aircraft system.As its importance role in supporting the flight control software is self-evident.The flight control software consist of two parts,airborne software and the ground. software. Airborne software and the ground complete production and the transfer control instruction,to specify the aircraft flight status, according to the desired trajectory of flying, and realize the interference suppression, emergency treatment and so on a series of work. This paper introduced the architecture of the software for a small UAV flight control system.%飞行控制系统是小型无人机(简称UAV)的核心系统之一，飞控系统软件分为机载软件和地面软件两部分，机载和地面软件配合使用，完成产生和传输控制指令，使飞机达到给定的飞行状态，按期望的轨迹飞行，并实现对干扰的抑制，应急处理等一系列工作。本文从软件系统架构层面介绍了一种小型无人机飞控软件的具体设计，经实际工程应用，该软件架构设计合理、模块划分恰当，具有较高的可靠性。
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