Vehicle speed displaying method and system

The invention discloses a vehicle speed displaying method which comprises the steps that under the situation that a positive speed limiting function is started, a set value of positive speed limitingis input; the set value of positive speed limiting by a user is obtained through an engine controller; the set value of positive speed limiting is sent into an instrument through the engine controller, and the received set value is directly displayed through the instrument; and a magnifying algorithm of the instrument during vehicle speed displaying is obtained, according to the current set valueof positive speed limiting, the engine controller conducts reverse operation during vehicle speed displaying by the instrument, the vehicle speed target value corresponding to the set value of positive speed limiting is obtained, and the vehicle speed of a vehicle is controlled by the engine controller according to the target value. The vehicle speed displaying method has the advantages that during vehicle speed setting, a