Abstract: For the normal coal production in magmatic intrusion area, according to the coal exitence law and the magmatic intrusion characteriics, the menipulative function to coal exitence was udied by means of the variation and the intrusive directions of magmatic rock, the coal thickness dramatically added in the concave area near the bedrock edge, where is a important target area for the prospecting of coalfield geology and finding coal in the diggings, the feature of zone reparability for the space ralation between magmatic rock and coal seam can be utilizad to direct the mine geology work. 6200000 ton coal is discovered by this method, and it is approved by exploration and production.