Chinese Annals of Mathematics (CAM), founded in 1980, is a comprehensive international mathematical journal carrying original papers on pure and applied mathematics. It aims at presenting latest achievements in mathematical research and promoting international academic exchanges. From 1983 onwards, CAM is being published in two series: Series A published bimonthly in Chinese, Series B published quarterly in English. Papers published in Series A (or B) do not appear in Series B (or A). Both Series A and Series B are distributed all over the world. CAM publishes original research papers from all parts of the world. It pays much attention in soliciting papers from scholars who are working actively in the frontiers of mathematical research. As an international journal of mathematics, CAM Ser.B has attained high recognition in the community of mathematics for its good quality.