Clock tree comprehensive optimization method based on H tree

The invention provides a clock tree comprehensive optimization method based on an H tree, and the method comprises the steps: 1) determining a root node of a clock tree according to a clock tree structure, and determining the coverage range of the H tree according to the position distribution of units connected with the root node and the distribution of basic units, thereby determining the distribution and number of tap points; 2) calculating the step length and the starting point according to the tap point range and the number, and planning the direction sequence of wiring; 3) using a setup file to control the whole layout and wiring process, including clock tree synthesis; 4) reducing delay and voltage drop by adopting a customized large driving buffer for an H-tree buffer and a tap point; 5) deleting a tap point coinciding with a macro position and a tap point of 0 fan-out; 6) fully utilizing a design rule to remove a buffer at the T-shaped intersection point of the H tree; (7) the wiring distance is short