This paper is a part of the study on boom-type roadheader' s directional excavation, providing a theoretical basis for the accuracy of directional excavation. The author has analyzed the characteristics of work environment and developed the strategy of automatic compensation for pose deviation according to four basic pose parameters, on the basis of the key technologies on automatic cutting control and the key technologies on body pose parameters' detection. In this way, the problem caused by pose deviation can be solved, and then, the 16 situations of pose deviation combined by four basic pose parameters can be solved as well.