Abstract: The main factors that affect drilling perameters rate and cost are bit type,bit pressure,rotary speed,hydraulic perameters,mud properties and bottom hole differential pressure,To optimize these parameters,it is necessary to establish a multiple drilling rate equation and cost equation,as well as constraints imposed by drilling technology and equipment conditions.Non-linear programming method can be used for the optimization of each bit run to achieve proper selection of individual parameters and a good match between them.However,for a whole well optimization which is a combination of a series of optimization of bit run multi-interval decision technique should be considered,and special algorithm should be introduced.