This study systematically review the efficacy and safety of JAKis among existing randomized, double-blinded, and placebo-controlled clin. trials of JAKis for the treatment of AD.This study was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines and registered in PROSPERO (CRD42020188514).We searched electronic databases (Embase, PubMed, and Cochrane Central Register of Controlled Trials) from their inception to Sept. 16, 2021.A total of 25 studies were finally included in the meta-anal., including 8 studies on topical JAKis and 17 on oral JAKis.Four kinds of topical JAKis (tofacitinib ointment, delgocitinib ointment, delgocitinib cream, and ruxolitinib cream) were applied, and 5 kinds of oral JAKis (baricitinib, abrocitinib, ASN002, SHR0302, and upadacitinib) were given at varying dosages.Overall, compared with placebos, the use of JAKis showed a significant improvement in the lesion score and pruritus: Eczema Area and Severity Index score (standard mean difference [95% CI], 0.79 [ 0.97 to 0.61]; P < .00001); investigators global assessment score (odds ratio [OR] [95% CI], 5.08 [3.78-6.82]; P < .00001); and pruritus numerical rating scale (standard mean difference [95% CI], 0.49 [ 0.67 to 0.32]; P < .00001).Although no significant adverse effects (AEs) were found for the topical JAKis, the oral JAKis showed an increased risk of at least 1 AE (OR [95% CI], 1.23 [1.11-1.36]; P < .0001) and the following most frequently reported AEs: gastrointestinal disorders (OR [95% CI], 2.49 [1.84-3.37]; P < .00001), nasopharyngitis (OR [95% CI], 1.23 [1.04-1.46]; P = .02), and headache (OR [95% CI], 1.57 [1.23-2.00]; P = .0003).Because of the higher risk of gastrointestinal disorders, nasopharyngitis, and headache during oral JAKi treatments, more attention should be paid to the AEs of patients treated with oral JAKis.