Abstract: Described here in the essay are the practice of developing 13Cr OCTG by the direct rolling process with the CC billet，covering such aspects as steelmaking，rolling control，heat treatment，internal surface defect treatment，and quality control，etc. The 13Cr CC billet with well-controlled quality is successfully produced by means of optimizing processes such as deoxidation，cooling，stirring，and the mold considation. In the rolling process，relevant measures are taken，including controlling heating temperature，optimizing the roll space and the guide plate distance，and using the Mo plug. And the hot-charging/rolling process of the CC billet is also described. The operation practice has proven that the hot-charging/rolling of the CC billet can significantly reduce the heating time，increase the production cycle，and a much lower proportion of internal fold compared to the cold billet. Moreover thanks to the internally-repair grinding treatment，the scrap rate of the 13Cr OCTG as rolled with CC billet can be controlled within the range of 2%，while the mechanical properties of the product can meet the requirements under the applicable specification. Finally it is concluded that using the said process of direct rolling the 13Cr OCTG with the CC billet can bring about such advantages as shortening the delivery cycle，saving the energy，eliminating some operation steps，and reducing the manufacturing costs and yielding significant economic benefits.