DS RSS Helmsman I is consisted of a dedicated mud motor and a guide tool. This system uses an against-and-push guidance system to guide drilling under full rotation condition. The pushing wings push against the wall according to time order, it uses the counterforce that wall does on tools to redirect the bit and furtherly realize the guiding drilling along the set direction. Also, the system can change the downhole working pattern freely by using the downward communication command. The technology used on DS RSS Helmsman I can reduce the drilling time, optimize the quality of the wellbore; do accurate and flexile track control, reach high displacement extension ability and realize three-dimensional obstacle crossing. All those advantages greatly improved the working efficiency and safety during drilling operation. So, it has become the most suitable drilling method in the large displacement horizontal wells and three-dimensional multi-target wells.