A velocity synthesis method with symmetrical mode was presented for the three parameter feedback control of a shaking table. The synthesizer has only two design parameters, and it is easy to digitize and meets the accuracy requirements. Compared with the existing analog velocity synthesizer, the design and application of the new velocity synthesizer is more convenient and practical.%针对地震模拟振动台三参量反馈控制中的速度反馈环节，提出一种具有对称形式的速度合成器，该速度合成器只有2个设计参数，易于实现数字化并且满足合成精度要求．与现有模拟速度合成器相比，设计和应用更为方便实用．
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