Coal basin of Northern Zhangjiakou formed earlier in the middle Jurassic, Mesozoic. Before the Mesozoic, the crust of this area was in a longterm stable shield tectonic status. The shield was activated in later early Jurassic. The coal basin initially formed in early middle Jurassic. Xiahuayuan coalbearing strata developed in some intermountain basins. The author analysis the exploration results and the coal occurrence of this area, and draw a conclusion that the early middle Jurassic coal basin mainly formed in the intersectional angle tectonic region of several ancient lands and tectonic belts with different directions. Xiahuayuan CoalBearing Formation was deposited in an environment with intense hydrodynamic conditions and fast sedimentation rate of terrigenous clastic materials. Minable coalbed mainly enriched in submargin of basin, privileged site and front delta at distal end of alluvial fans, or relatively stable sedimentary environment among sectoral diffluence chanels. Coalbearing strata and coal seam were mainly kept in the tectonic environment with weak reformation, relatively stable or slow sedimentary rate. Based on the new understanding of above, the author presents several predicting area of resources and enlightens the future reconnaissance and coalexploration.