Fast transferring between geodetic coordinates and sphere triangle facets is of the same importance as properties of equal area and shape for global grid using for spatial information.Based on the spherical icosahedron case of Equal Angle Ratio Projections(EARP)
a new Spherical Triangle regional Quadtree(EARPIH)is constructed.There are two ways to build up the partition model:one is to evenly discompose the triangle projection plane and the other is to discompose the sphere directly.The coordinate transformation can deduce to locate a point into the evenly triangle network.The partition model is compared with several famous models such as SQT