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The frequency modulated continuous wave (FMCW) synthetic aperture radar (SAR) has the properties of compact size, lightweight, low cost and low power dissipation, which provides great potential in the application of small unmanned aerial vehicle (UAV) platforms. The imaging characteristic of rotating target for FMCW SAR is analysed based on the construction of received signal model. In development, a passive barrage jamming method for FMCW SAR based on micro motion modulation is proposed. This method makes use of the rotating angular reflectors to form jamming strips in range and azimuth 2D direction, and then the target screened is protected effectively. The choice of the parameters of rotating angular reflectors is discussed in detail. Finally some simulations are given for validating the theoretical derivation and the effectiveness of the proposed passive barrage jamming method.