The invention discloses a graphics primitive padding method based on collective drawing splicing and a method thereof, so as to avoid the problem that system memory resource can be wasted by collective drawing unit lattice data generated and stored ineffectively. According to size information of the collective drawing unit and objective page, and ensuring that the size of the collective drawing unit is larger than that of the objective page, each intersection area of the collective drawing unit and the objective page is ensured when the collective drawing unit is spread to the objective page in sequence; a sub collective drawing unit containing the intersection area is divided from the collective drawing unit respectively according to each intersection area which is ensured; rasterizing treatment is carried out on the each divided sub collective drawing unit; based on lattice data of each sub collective drawing unit which is processed, the padding of primitives in the objective page is realized.