Objective To systematically review,evaluate and summarise the best evidences about lifestyle guidance for women at high risk of GDM in domestic and international databases,therefore to provide evidences for nurses to guide the women at high risk of GDM to prevent GDM.Methods Systematic search BMJ Best Practice,Cochrane Library,PubMed,Web of Science,Science Direct,Medlive,National Institute for Health and Care Excellence,International Diabetes Federation,International Diabetes and Pregnancy Study Groups,Australian clinical practice guidelines(ACPG),ACPG,CNKI,Wanfang,CBM datebase from June 2015 and June 2022,which provide the lifestyle guidance for women at high risk of GDM.Two of the researchers examined and evaluated the quality of the included articles respectively.Results A total of 22 articles were included,including 6 of clinical guidelines,2 of expert consensuses,10 of systematic reviews or Meta analysis and 4 of randomized controlled trials(RCTs).A total of 17 pieces of evidence were extracted and summarised into 4 themes,including early screening,diet guidance,exercise guidance and weight guidance.Conclusion The best evidence summary in this study provide an evidence-based clinical nursing for health care workers to guide the lifestyle and formulate lifestyle intervention programs for high-risk groups of GDM.