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Using uniformity design theory and software, the machine to pave geomembrane lining on the trapezoid canal has been researched and tested. The method of evaluating the effect to pave geomembrane lining on the canals was put forward; the influence rules of the machine forward velocity, the brush slope angle, the brush height to the effect of pave geomembrane lining were analyzed, and the design parameters were optimized. The experiment testified that the mechanism to pave the lining in initiative and synchronization and for the brush to follow and contour and unfold the geomembrane fitted to the working of paving lining on canal.