Coil temperature control always plays a very important role to coil quality in Hot Strip Mill.Due to the limitation of computer capability in the past,it is hard to get the detail coil processing history of each sample point on run out table.Now,the modern computer technology has already advanced enough to apply Object Oriented Design on Coil temperature control.This not only makes past impossible possible but also raises various applications.The applied Object Oriented Design contains from object function analysis to the way objects chain created and reflected to each sample object on coil,to make the coil temperature prediction hit the target.