Purpose :Anthracycline based chemotherapy regimen is the milestone on the treatment of breast cancer . A sequential protocol, using docetaxel or Paclitaxel after an anthracycline-based combination is primary treatment for high-risk breast cancer .Despite its efficient antitumor activity profile, the use of conventional anthracycline in clinical practice is limited due to it's the risk of cardiac toxicity. The meta analysis show that subclinical cardiotoxicity was 17.9% whereas the incidence of clinically overt cardiotoxicity was 6.3%. Overall cardiovascular events occurred in 10.6%(Lotrisone , Am J Cardiol. 2013).Many patients have healed from breast cancer while they are snatched lives because of heart issue from chemotherapy using anthracycline. There are a lot of clinical trials exploring the possibilities of chemotherapy regimen without anthracycline ,however the recent result has shown anthracycline is indispensible for the patients whose axillary nodes are involved or triple negative breast cancer (ASCO 2016 ).So our target is to find a kind of anthracycline which is of equal efficiency with conventional anthracycline while less cardiac toxicity. Pegylated Liposomal Doxorubicin(PLD) is a novel kind of anthracycline. It distributes into cardiac cells lowly and releases Doxorubicin (DOX) slower to avoid peak plasma concentration, so it is of significant less cardiotoxicity compared to free DOX. It also achieve non-inferior efficacy at 50mg/m2 to conventional anthracycline in Metastatic Breast Cancer (MBC).( M. E. R. O'Brien, ,Annals of Oncology,2004;).