Two kinds of auxiliary templates, involute template and helix template, were developed to remedy the shortages of Portable Coordinate Measuring Machines (PCMMs) in sampling strategy and evolution method for large gear measurement. By using the templates to mark the measurement points of tooth profiles and spiral lines on the gear flanks, the experimental research were performed on the position repeatability measurement of the gear. An Articulated Arm Coordinate Measuring Machine (AACMM) and a Laser Tracker Measuring System (LTMS) were used to measure the gear standard with an outside diameter of 1 m. All the measurement data were evaluated by a software INVOLUTE Pro, and the measurement uncertainties of profile and helix were obtained. The result demonstrates that the AACMM is more precise than LTMS based on above method and the maximum deviation is 8.16 μm as compared to the calibration values. The experimental results verify the validity and feasibility of the method, and provide the basis for the application of large gear measurement using PCMMs.