OBJECTIVE：To reevaluate the guidelines/cons ensus，systematic review/Meta-analysis of proton pump inhibitors （PPIs）in the prevention of drug-induced gastrointestinal injury ，and to provide evidence-based reference for its clinical use. METHODS： The relevant guidelines/consensus and systematic review/Meta-analysis literatures at home and abroad were systematically reviewed ，and the re evaluation was carried out from the effectiveness ，safety and economy dimensions to analyze the current situation of clinical use of PPIs in the prevention of drug-induced gastrointestinal injury in adults and children. RESULTS ： A total of 14 clinical guidelines/consensus and 10 systematic review/Meta-analysis literatures of PPIs for the prevention of drug-related gastrointestinal injury at home and abroad were sorted out and included. In terms of effectiveness ，PPIs could prevent various drug-related gastric mucosal damage ，gastrointestinal bleeding and other damage to the digestive tract ，but PPIs had not yet obtained the indication for children in China ；PPIs were widely used in the treatment of children ’s digestive tract diseases ，which belonged to off-label medication. In terms of safety ，the common adverse reactions of PPIs included headache ，gastrointestinal symptoms，etc. There may be risks of kidney disease and fracture during long-term application. In terms of economy ，for some patients with digestive tract and cardiovascular disease risk ，the economic benefit of NSAIDs combined with PPIs were higher ； esomeprazole 20 mg and 40 mg daily were equally effective in preventing ulcer recurrence caused by NSAIDs ，but increasing the dose could not improve the preventive effect. CONCLUSIONS ：The preventive effect of PPIs on drug-induced gastrointestinal injury is supported by evidence-based evidence. It has good safety in adults and has certain economic benefits ；but it belongs to off-label drug use in children in China ，and the safety and economy still need to refer to the results of adult studies. In the future ，a number of multicenter prospective clinical studies based on Chinese pediatric population are still needed to provide more support for the prevention and treatment of drug-induced gastrointestinal injury by PPIs in children.