Casing and liner running process is an important part of the whole drilling process. The traditional casing and liner running had to be slow and drilling fluid should be periodically grouted into pipe string; Especially for deepwater well and those wells with narrow density window of drilling fluid, it is difficult to control the suitable pipe string lowering speed and circulation loss is extremely easily caused by surge pressure. Casing and liner fast running technology is being studied to improve operation efficiency, ensure downhole safety and satisfy the requirements of drilling process. This paper introduces casing and liner fast running technology about its main principles, characteristics, tools and operation method, as well as the field application and some attentions, analyzes and summarizes some difficulties which might occur in operation and puts forward corresponding suggestions, which can be reference to the similar deepwater well drilling operation.