A method and a system for rendering a boundary of a map area within a game map, a computer readable storage medium, and a method for rendering includes: obtaining a boundary of a map area within a game map, and expanding the boundary toward the inside of the boundary along a normal direction of the boundary to form a fuzzy boundary; obtaining each boundary vertex of the fuzzy boundary, and linearly extending a preset distance from the boundary vertex along the normal direction of the fuzzy boundary to form a boundary grid; rendering a boundary color within a first range between the fuzzy boundary and the boundary grid, and rendering a boundary transparency within a second range that expands a preset distance from the fuzzy boundary to the inside of the boundary; rendering the boundary color from the first range with convolutional incremental expansion until the second range is covered.