This paper selects the mainstream of the freight transportation，i.e.，small and medium freight enterprises to find a best way to platform transformation. An evolutionary game model is established and two transformation strategies，i.e. autonomous operation and joint operation are proposed. The results show that: ① When the extra benefits of group and group are more than their costs，both parties tend to adopt the autonomous operation transformation strategy and the joint operation. Moreover，the specific choice will be affected by the extra benefits and the allocation ratio. When the conditions are not met，both sides of the game can only adopt the autonomous operation strategy. ② The more the additional revenues，the higher the probability of joint operation transformation strategy will be chosen. ③ An optimal income allocation ratio can be found，which makes the both sides of the game choose the joint operation transformation strategy.