The MSE surveillance systerm provides the ability to detect changes in the efficiency of the drilling system. MSE can be expressed mathematically in terms of controllable parameters Weight on Bit (WOB), Rate of Penetration (ROP), Revolutions per Minute (RPM) etc. Once the optimum WOB was determined, the correlation with Torque and Penetration per Revolution was used to determine optimum values for those parameters for a given drilling situation. The MSE surveillance systerm provides the ability to detect changes in the efficiency of the drilling system, more or less contimuously. The use of MSE surveillance is a key feature of well planning and operational practice, MSE analysis has resulted in redesigned in areas as divers as well control practices, bit selection, BHA and ECD design, makeup torque, derectional target sizing and motor differential ratings. Through lots investigation and reseach, my research group has redesigned the MSE calculation modes and developed a MSE software system and applied in some wells and developed a software, whose ROP was increased an average of 40% on several pilot wells in Changning area.