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An automated mechanical transmission controlled by an optimized dynamic 3-parameter gear-shift schedule, which makes maximum use of the power-train potential and meets well with the optimal driving conditions of the vehicle, is developed in this paper. Two methods to calculate the 3-parameter controlled shift schedule are introduced-one of which is of graphic, and the other, of analytic. For the latter, the mathematical model of shift as well as an actual computer program is given, which is very accurate and convenient for use with the computer. To make full benefit of the 3-parameter-controlled shift schdule in getting better fuel economy, dynamic performance and favorable riding comfort, the throttle angle should be changed during shift which, too, is a break through when comparing with the constant throttle angle now used all over the world.