The invention relates to a direct solution technology-based VLSL standard unit layout method, and belongs to the technical field of VLSI physical design automation. According to the method, global VLSI standard unit layout problems are solved through establishing global density functions of the problems, carrying out convolutional smoothing by utilizing Gaussian functions and combining a wire length model. The key points of the technical scheme are as follows: (1) being different from the manner of obtaining discrete density function values by using a uniform bin division method, the method can more correctly depict the distribution condition, on a layout area, of units through a global density expression constrained by a calculation unit and the whole layout area in an overlapping area; (2) through considering that the discretion of the units is related to the densities of the places where the units are located and the densities of the surrounding places, the model carries convolutional smoothing on the global density functions by using the Gaussian functions, a penalty function method is adopted convert the wire length target and density constraint of VLSI global layout into unconstrained nonlinear planning problems, and a proper optimization technology is selected to carry out optimization.