A thermal module includes a heat spreader (50) for contacting with a heat-generating electronic device mounted on a printed circuit board, a heat sink (60), a heat pipe (70) thermally connecting the heat spreader and the heat sink. A frame (80) is detachably mounted on the heat spreader, for fixing the heat spreader to the printed circuit board so that the heat spreader can thermally contact with the heat-generating device on the printed circuit board. The heat spreader has a simple polygonal configuration. The frame is formed by stamping a metal sheet or plastics injection molding.