Proper sliding mode variable structure controllers are designed based on variable structure control theory, which can make master and salve unified chaotic systems with external disturbances and parameter uncertainties reach to projective synchronization at a scal-ing factor. The controllers are proved theorically that they can make error systems of full states asymptotically decay to zeros and are insensi-tive to external disturbances and parameter uncertainties and thus it is of strong robust nature. Finally feasibility of this kind of proposed controllers is also demonstrated by numerical simulation results.%基于变结构控制理论,设计出合适的滑模变结构控制器,使受到噪声、摄动等外部干扰和带有参数不确定性的主从统一混沌系统按所给比例因子达到投影同步；理论上证明了所给控制器能够使闭环同步误差系统全局渐近稳定于零值且不受外部干扰和系统参数不确定性的影响,具有较强的鲁棒性；最后给出的仿真模拟进一步验证了所给控制器的可行性和有效性.
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