Abstract: In order to increase metro train travel speed, both domestic and foreign metros require that the vehicle acceleration should not be less than 1.0 m/s2 and the deceleration should not be less than 1.1~1.2 m/s2. At present, the newly built metro mostly uses 4M2T formation train with higher acceleration and deceleration, the purpose of which is also to increase train travel speed. However, according to the GB 50157—2013 Code for Design of Metro, the starting acceleration and braking deceleration calculated by train traction should not be greater than 90% of the maximum acceleration and of the common deceleration, thus no greater than 0.9 m/s2\1\. Based on first phase section of Chongqing Rail Transit Line 5, 3M3T and 4M2T formation trains of B\|type vehicle are adopted respectively, and simulation calculation is conducted according to 100% traction force and 90% traction force. Four sets of traction calculation diagrams are drawn. The analysis arrives to the same conclusion: the actual train acceleration and deceleration are generally barely reaching the normative limit; when the train travels under 90% traction force, travel speed decreases, and the traction power consumption decreases slightly.