The invention relates to a grid method for drawing a city map and an application thereof, which introduces a method for drawing the city map by the grid method. The method is characterized by increasing the information amount and functions of a grid map by tens of times through the function match of a series of assisted diagrams and also supplying a new space for the digital and intelligent management of a city. The map is drawn on the basis of a longitude and a latitude of the earth, but because the city area is even smaller than the surface area of the earth and an error generated by simulating and replacing the longitude and the latitude of the earth by a grid line is infinitesimal, the method is feasible. The method sets the area that 1km multiplies 1km is equal to 1km to be a grid basic unit, 100 basic units of 10*10 form a grid cell, the city map is drawn on the grid cell, a street, a community and a building of the city map are all relative with the basic units (grids), and each basic unit has regular and non-repeating name signs, thereby bringing convenience for searching and positioning each place name. In order to improve positioning accuracy, smaller grids, such as a subunit, an ultra-fine unit, and the like can be used as a calibration, and the accuracy can be improved within 10m, 100m, and the like. When the grid cell area of a big city is not enough, the grid cell expansion of grade 1, grade 2, and the like can be used, and orient expansion can be also adopted according to a city shape.