For decades, the transmission of Cantonese opera in Hong Kong and China has faced considerable challenges, including a lack of valid assessment. This study aims to propose a holistic theoretical framework for the assessment of Cantonese operatic singing after {1) analysing two graded examinations of Peking opera and Cantonese opera and {2) interviewing ten Cantonese opera experts and their students from Guangdong and Hong Kong. Findings reveal that the designs of the existing graded examinations in xiqu are still developing; multiple problems exist in the daily assessment practices including: (1) dependence on subjective perception, (2) a focus on the assessment of performance skills and a lack of multidimensionality, and (3) an inclination to momentary judgment and a lack of sustainability in assessing and documenting students' progress. Suggestions include introducing criterion- and standard-based assessments and increasing cooperation between artists and education experts, which may further promote the inheritance, popularity, and development of this traditional art form.