Objective To investigate the current status of standardization of cancer pain assessment by nurses in good pain management ward. Methods Totally 479 medical records from June to September 2017 were selected from the good pain management ward of 6 hospitals from Fujian,Jiangsu,Zhejiang,Henan provinces and Guangxi Zhuang Autonomous Region. The self-developed questionnaire entitled “Evaluation Form of Cancer Pain Assess-ment” was used to evaluate the standardization of pain assessment recorded in those medical records. Results Among 479 medical records,410（85.59%）recorded standardized pain assessment satisfactorily. However,69（14.41%） records did not meet the standardization criteria. The standardization scores of each dimension were 98.80±8.85 for regular assessment,99.48±5.09 for quantitative assessment,93.57±14.12 for comprehensive assessment,and 92.41±16.15 for dynamic assessment. Nurses with different education degrees,titles,and working years had significantly different assessment qualification rates（P<0.05）. Conclusion Nurses in the good pain management ward have a higher standardization rate of cancer pain assessment.Nurses’ ability of assessing the pain comprehensively and dynamically should be improved. Those nurses with higher education degree（bachelor or above）,titles,and working years can perform more standardized pain assessment for cancer patients.