ABSTRACT229 Chinese‐language biomedical journals from A Guide to The Core Journals of China were investigated for their guidance on 14 ethical issues. The issues of authorship, duplicate submission, privacy and confidentiality, and integrity of the data were mentioned in more than 50% of the journals. Except for the issues of authorship and protection of animals in research, significant differences were found between Chinese Medical Association Publishing House (CMAPH) journals (n = 67) and non‐CMAPH journals (n = 162) (P < 0.05). 66 of the 229 journals did not update their instructions for authors regularly. 196 journal instructions listed authorship criteria, while the other 33 did not. Clinical trial registration policy was required by 26 (11.3%) journals, among which the CONSORT statement for randomized trials was required by 23, and only one journal guided the authors to work in line with the EQUATOR Network. The study concludes that the situation of publishing ethics in the instructions for authors of Chinese biomedical journals is not favorable, and that Chinese biomedical editors should learn more about publishing ethics in order to reduce opportunities for publication problems.