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.　©　2023　Science　Press.　All　rights　reserved.