Basic researches on phosphorus chemistry have been developed rapidly during the past two decades. First, a number of low and high coordinated phosphorus compounds have been synthesized, and their reactivities and properties have been widely investigated; secondly, it is explored that phosphorus element plays an important role in life chemistry involving phosphorylation reaction, correlation between configuration and activity of c-AMP, as well as the synthesis of DNA, etc. Remarkable progress has been well known in these areas. Basic researches on phosphorus chemistry have been developed rapidly during the past two decades. First, a number of low and high coordinated phosphorus compounds have been synthesized, and their reactivities and properties have been widely investigated; secondly, it is explored that phosphorus element plays an important role in life chemistry involving phosphorylation reaction, correlation between configuration and activity of c-AMP, as well as the synthesis of DNA, etc. Remarkable progress has been well known in these areas.