The installation errors have great influence on the measurement results of gear measurement center (GMC). Focused on the problem of the ZC1 worm helix deviations evaluation method, based on the measurement principle of ZC1 worm helix in GMC, the influence mechanism of installation errors on worm measurement is analyzed. The installation error correction model is formulated, and the evaluation method of ZC1 worm helix deviations based on installation error correction is established according to the definition of helix deviations. The measurement of ZC1 worm helix deviations is implemented on the GMC, and the helix deviations evaluation results are obtained under the installation conditions. The maximum difference between the measurement results before and after the installation error correction is reduced from 76. 2 μm to 4. 2 μm. The ZC1 worm helix deviation evaluation method proposed can effectively eliminate the influence of installation errors on the helix deviations measurement results during the measurement of GMC.