Abstract: Even casting billet crack defect is one of the important factors affecting the plate rolling and cost control,further study of this index can effectively reduce unnecessary crack rate and process sequence consumption, reduce waste productivity, improve product quality, at the same time effectively reduce the production cost, Increase the delivery capacity and market competitiveness. This paper is about through the tracking of a large number of continuous casting billet heating and rolling process, collect the corresponding raw material processing process,temperature control improvement measures, applied to the actual production, better to improve the quality of rolling,not only reduce the semi-finished steel intermediate process inventory pressure, effectively improve the steel production efficiency and delivery time, also significantly improve the economic benefit of the enterprise.