12131 Background: Informed consent is very important aspect of treatment, in western countries, a diagnosis of malignancy should be delivered the paient directly. It was the decision of the patient for further disclosure. However, in China, people are always family centered decision making, a diagnosis of cancer is traditionally delivered to the family members, with a protective assumption. We used anonymized questionnaire to investigate the attitude of Chinese people towards to cancer diagnosis disclosure and correlated factors. Methods: This is a survey study conducted by a web system named “Wenjuan Xing”. The study questionnaires were designed in dual English and Chinese. answered by the same person. The regarding questions that answered by the same person are as following: “If your close family member is diagnosed with a malignant tumor, would you like to tell him the truth?”, “If yes/no, what’s your reason?”. Demographic information include gender, age, economic status, education level, health condition, residential region, occupation, nationality and major reasons. The survey link was placed on Wechat contact of these investigators, social media and also distributed in Oncology Center of a general hospital in Mainland China. The answers of the questions were captured directly online, data can also be exported into excel format for compiled analysis. Results: A total of 1470 people completed the survey questions from January to July 2020. The potential factors which influence disclosing diagnosis were registered, 1041 (70.8%) family members are in favor of informing the diagnosis to patients, 429 (29.2%) are not. The main reasons for disclosure diagnosis are ‘it is his or her life, he/she has to be in control’ (N=832) and she or he can plan his/her remaining life and leave the world with no regret (N=588). The famliy member who hide the diagnosis worry that paitents could not handle the stress would have poor quality of life (N=295) and die faster(N=323). 1425(96.9%) people want to know the diagnosis if they have a malignanti tumor, while 45 (3.1%) don’t want to know.The univariate analysis revealed educational level, health condition and residential region are correlated to disclosing diagnosis. The logistic regression anaylsis show a significant effort to disclosing diagnosis(OR= 1.9, 95% CI (1.4, 2.7) P<0.001).Interaction and stratified analyses were conducted according to education level and redidential region (P interaction= 0.0406). In the high education level group, people who live in other countries(America, Europe) (P=0.009 OR=29.7 CI 2.3-375.7) more likely to disclose the diagnosis compared to mainland in China. Conclusions: The majority of Chinese people want to know the diagnosis. People who have higher education level and live in western countries more likely prefer disclosure of diagnosis to patients.