The cross section of Beijing Yingshan Mountain tunnel is superlarge scale supershallow overburden,by using of positive step are guiding adit excavation on method are both satisfactory in effect and cost.the measures are using New Austrian New Austrian Method Principle as the guide;Medium part soil is left for supporting in upperstep excavation,double pilot hole excavation is conducted at lower step the excavation surface is widened and heightened and fixed by anchor rod,etc.