An H-V tile-expansion router based on the H-V model of cornerstitching data structure is presented in this paper. The H-V tile-expansion consists of a sequence of alternatingH(V) and V(H) space tiles, the expansion searching of which is guided by a heuristic cost function using the A*technique and the damping concept, and the tile growing of which is governed by the constrained expansion area, the limited expansion depth, and the oriented expansion direction. The net-forest structure combines several H-V tile-expansions; it obtains near-optimal connection paths with a minimum number of bends, and guarantees that a feasible solution can be found if one exists. The router is well suited for wiring hierarchical modules by M3 technology and as part of the IDAF-a database management system for VLSI design system. In addition, we also present the results of running this router on several layout examples. Experimentally, our router is always faster than the H-tile-expansion method.