Abstract: Focusing on the goal of establishing a national primary standard for gear helix calibration, the first hybrid gear helix measurement standard has been developed successfully by independent research, which transforms the complex spatial three-dimensional curve measurement into the simultaneous measurement of laser interferometric length measurement and self-calibration rotary angle, originally realizes the shortest traceability chain for the fundamental quantities of length and angle. The calibration and measurement capability of the gear helix measurement primary standard has reached the international advanced level by verification of international comparison results. The helix values obtained from the standard have been widely used in domestic calibration institutions, universities, and gear manufacturing companies, providing strong technical support for the development of the gear industry.