Abstract: Mealybug Phenacoccus solenopsis Tinsley (Hemiptera:Pseudococcidae) is a new invasive pest,owing to its potential damages and rapid spread,it has been considered as an important quarantine pest in China since 2009.For improving the precaution of this new invasive pest by all kinds of people,the biological and ecological characterisitcs of this Mealybug,viz.,distribution at home and abroad,host plants,harm characters and life cycle were introduced in this paper, and the control measures such as quaratntine and control in happening areas of this Mealybug were also put forward.In future,the molecular identification,genetic diversity of different geography populations,descendiblity relationships in different populations,early prevention and quick forecasting method, suitable life region,risk evaluation of potential diffusing area and rout distribution of P.solenopsis should be further studied.