Double-flank　gear　rolling　test　is　widely　used　in　high　speed　gear　measurement　in　workshop,　but　the　measurement　results　may　be　influenced　by　measurement　force.　An　algorithm　is　proposed　for　gear　tooth　radial　deformation　by　measurement　force　in　the　test.　The　numerical　results　calculated　in　MATLAB　considers　different　measurement　forces　and　materials.　Finite　Element　Method　(FEM)　used　analyzes　the　radial　tooth　deformation　under　the　influence　of　the　measurement　force.　The　maximum　difference　of　radial　deformation　between　the　two　methods　is　0.1　mu　m.　Experiments　are　carried　out　on　a　tester　under　different　measurement　force　varying　from　0.5　N　to　4　N.　The　variation　of　tooth-to-tooth　radial　composite　deviation　is　3.0　mu　m,　while　the　variation　in　MATLAB　is　6.12　mu　m.　Compared　to　ISO　1328-2:1997,　the　product　gear　accuracy　grade　deviates　from　grade　11　to　10.　The　algorithm　proposed　can　be　used　to　calculate　gear　radial　deformation　influenced　by　measurement　force　in　double-flank　gear　rolling　test.