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Stage cementing is usually applied in primary cementing in gas wells and long interval cementing. A stage tool that is free of drilling plug after cementing is a recently emerged new tool. Free of drilling of plug (DOP-free) after cementing can shorten well construction period, simplify well casing program, and then reduce rig time and drilling cost. It has the tendency to take place of conventional stage tool. But its operation reliability on DOP-free affects its extensive application in field application. In this paper, an innovative DOP-free stage cementing tool study and field application has been introduced in detail. Comparing to conventional stage tool, the specifical tool has not only operation and casing seal reliability as conventional, but also high reliability in DOP-free. Systematic tests and pilot field application indicated that it is also suitable for complicated hole cementing condition, and the DOP-free tool will substitute conventional stage tool next.