In order to promote the clinical diagnosis and treatment of obstructive sleep apnea (OSA) in Chinese children, it is urgent to construct evidence-based guidelines. The protocol and a formal version of the “Chinese guideline for Diagnosis and Treatment of Obstructive Sleep Apnea in Children” will be drawn up by referring to the “World Health Organization Guidelines Development Manual”. This protocol mainly introduces development methodology and process of guideline, including the significance, purpose, target population, users, members of the designated group, collection and determination of clinical problems and outcome indicators, evidence acquisition, evaluation and synthesis, the generation of recommendations and so on.