The head rice yield is a key indicator for evaluating rice processing quality, commodity value, and low-loss grain-saving traits, and it has important strategic significance for ensuring food security and promoting the quality and efficiency improvement of the rice industry. Although China has established a standard system for head rice yield identification, there are still problems such as scattered standards, poor technical connection, significant differences in method orientation, inconsistent grading thresholds, and lack of grading standards for processing low-loss properties, which are difficult to accurately meet the actual needs of rice low-loss breeding and industrial grain-saving and loss-reduction. To address the above shortcomings, this paper formulates the technical specification for the identification of head milled rice rate for low-loss processing of rice on the basis of systematically integrating existing national standards, industry standards and relevant research results. This specification systematically standardizes the key technical links such as sample preparation, instrument and equipment debugging, hulling, milling, head rice yield identification, result calculation and grading judgment, aiming to provide standardized technical support for the accurate evaluation of head rice yield for low-loss processing of rice germplasm resources and the identification and screening of low-loss breeding materials, and help improve the efficiency of rice low-loss quality breeding and the level of grain-saving and loss-reduction in the entire industrial chain.