Objective:To develop and evaluate the Cancer Dangerous Factor and Aura Manifestation List(CDFAML).Methods:A self-report questionnaire was developed.A total of 639 cancer patients were asked to complete the questionnaire and evaluate the importance of each item.And 129 relatives and 103 doctors and nurses were also asked to evaluate the importance of each item.706 healthy people whose demographics were similar to the patients were asked to complete the list.Results:①CDFAML was finally refined as a list with 19-item;the 4 dimensions including somatic,psychological,social factor and life habits.②The list had good construct validity and could well reflect the dangerous factor and aura manifestation of the onset of cancer.The 4 dimensions and the total score of the patients were significantly different from healthy people's scores.③ The test-retest coefficients for the 4 dimensions and the total score were 0.82,0.76,0.80,0.77 and 0.83 respectively;Cronbach ? was 0.76,0.79,0.83,0.80 and 0.86 respectively.The split-half reliability of the questionnaire was 0.90.Conclusion:CDFAML has high validity,reliability.