Abstract: Objective To assess the quality of randomized controlled trials research papers among Chinese abstracts for breast cancer. Methods A systematical databases search was conductedto identify papers about RCT of breast cancer published in China."Abstract-CONSORT" statement was used to assess the quality of reporting.Statistical analysis was performed using Meta-Analyst software. Results A total of 965 RCT were identified.The serious reporting flaws were appeared for RCT abstract of breast cancer,especially,regarding following items:thestudy identified as randomized in title(1.1%,95%CI:0.6%-2.0%),randomization 3.8%,95%CI:2.8%-5.2%),blinding(1.0%,95%CI:0.6%-1.9%),statistical methods(11.5%,95%CI:9.6%-13.7%),numbers randomized(7.5%,95%CI:6.0%-9.3%),participants (12.2%,95%CI:10.3%-14.4%),trial registration(13.1%,95%CI:11.1%-15.3%),funding (8.1%,95%CI:6.5%-10.0%).The improvements in participants,intervention,statisticalmethods,results and conclusions were increased when abstract CONSORT was published.There was statistical significant difference in study identified as randomized in title,randomization,and participants and funding betweenRCT abstract recorded by CSCD andnon-CSCD (international papers). Conclusion The serious reporting flaws were appeared for RCT abstract of breast cancer published in Chinese.More attentions should be made for editors and authors.