The invention discloses a gear shifting method based on road parameters. The gear shifting method comprises the following steps of enabling positioning data outputted by a GPS receiver of an automobile to be matched with an electronic map so as to determine the position and a running route of the automobile, enabling road parameters to be matched with the gear of the automobile, and shifting the gear of the automobile according to specific road parameters; then enabling the positioning data outputted by the GPS receiver to be matched with the data of the electronic map so as to determine the specific position of the automobile on roads, and based on the position, acquiring environmental parameters of the current road in a real time manner; and according to the parameters, adjusting gear shifting parameters, so that the gear shifting is more suitable for the current road environment, and the adaptability of the gear shifting to the road environment is strengthened. Comfortable and safe driving environment is provided for people, and the power performance and the economic efficiency of the automobile are improved. A gear shifting method under different road conditions is treated, so that the automobile can well meet gear shifting requirements under different slope-road conditions.