ABSTRACT
Olive oil is one of the important byproducts in agriculture. It is rich in oleuropein, which can be hydrolyzed into several bioactive phenolic compounds, including hydroxytyrosol (HT).There are many literatures have been confirmed that HT has significant pharmacological effects in the anti-inflammatory, anti-virus, regulation of metabolic disorders and treatment of degenerative diseases. However, HT has severe instability in vivo and in vitro. It is a challenge how to improve its stability through structural transformation or utilization of pharmaceutical means to processing. This paper will focus on biological activity of HT and its stability improvement, and provid some new ideas for expanding the research and promoting the development of HT in the field of Medicine.