ObjectiveTo systematically evaluate the clinical efficacy of systemic antibiotic combined with non-surgical periodontal therapy for aggressive periodontitis. MethodsWe searched PubMed, EMbase, The Cochrane Library, WanFang Data, CBM, VIP and CNKI databases from inception to January, 2016, to collect randomized controlled trials (RCTs) about non-surgical periodontal therapy combined with systemic antibiotics for aggressive periodontitis. Two reviewers independently screened literature, extracted data and evaluated the bias risk of included studies. Then meta-analysis was performed using RevMan 5.3 software. ResultsA total of 8 RCTs involving 236 patients were included. The results of meta-analysis showed, compared with non-surgical periodontal therapy alone, non-surgical periodontal therapy combined with systemic antibiotics showed a significant additional probing depth reduction at 3-, 6- and 12 months follow-up (MD=0.33, 95%CI 0.25 to 0.41, P<0.00001; MD=0.53, 95%CI 0.44 to 0.62, P<0.00001; MD=0.52, 95%CI 0.23 to 0.81, P=0.0004), and a significant clinical attachment gain at 3-, 6- and 12 months follow-up (MD=0.43, 95%CI 0.30 to 0.56, P<0.00001; MD=0.44, 95%CI 0.33 to 0.55, P<0.00001; MD=0.43, 95%CI 0.20 to 0.65, P=0.0002). ConclusionCurrent evidence shows that the treatment of patients with aggressive periodontitis, systemic antibiotic (Metronidazole and Amoxicillin) combined with non-surgical periodontal therapy has a significant additional effect than non-surgical therapy alone. However, because of the limitation of quality and quantity of included studies, the above conclusion still needs to be further proved by conducting more high-quality and large-scale RCTs.