Abstract: The National Institute of Metrology of China has developed a new primary standard for positional angles, catering to the needs of angle measurement in machine tool rotation positioning, aviation and aerospace attitude control, and spatial orientation in surveying instruments. This standard, aligned with the national verification scheme for plane angle measuring instruments, incorporates advanced technologies such as ultra-precise rotational positioning, self-calibrating scanning interferometry, and continuous full-circle compensation. It enables integrated measurement of both whole and subdivided angles, offering diverse functionalities like static and scanning measurements. This standard spans a measurement range of 0° to 360°, with a sampling step finer than 0.01″, and achieves a measurement uncertainty of U=0.03″ (k=2). It provides a continuous full-circle traceability platform for angle measuring instruments.