A serious CO toxic accident occurred in Yanbian,Jinlin Province in February 13 16, 2006.An analysis of the meteorological elements of the event is made. The re sult shows that the strong inversion occurs in the surface layer with a low heig ht of maximal inversion top,and about zerowind velocity occurs near the surfac e. Both are the main reasons to cause the event.At the same time,the temperature rises and the air pressure falls evidently. It is unusual in the last 46 years that the suitable meteorological element,but only when several meteorological el ements control the same region together,will the CO toxic accident take place.