Abstract: The reasons of central segregation in continuous casting square bloom of bearing steel have been analyzed and the effect of superheat,electromagnetic agitation,intensity of cooling,pulling rate and other factors on central segregation has been investigated,and some countermeasures to prevent central segregation have been implemented at Laiwu special steel company,and considerable effect has been achieved. A conclusion has been arrived at that increasing equiaxed crystal and reducing deformation of oval-shaped,by increasing electromagnetic agitation and reducing intensity of cooling and pulling rate,can improve central segregation of continuous casting of bearing steel.