Statistical Analyses of the Type Ⅲ Bursts and CMEs During the 23rd Solar Cycle

The Statistics analyses of the microwave type Ⅲ bursts,coronal mass ejections(CMEs),Hαflares and relevant events observed with 5200-7600MHz spectrograph at the National Astronomical Observatory during the 23^rd solar cycle are carried out in this article.It is found that the relation between the microwave type Ⅲ bursts and CMEs is not closer than that between the type Ⅱ radio bursts and CMEs;the Hαflares corresponding to the CMEs are all gradual flares.