The reason why Didi Dai wants to go to Jinhua for training is that Jinhua is one of Didi Dai's training bases and the traffic situation in Jinhua.

1. Jinhua is one of the training bases for Didi Daidai. There is a training center for Didi Daijia, with corresponding training facilities and teachers, which can provide comprehensive and professional training services for drivers.

2. The traffic situation in Jinhua is complicated, including different sections and road conditions such as mountain roads and expressways. Drivers can receive training and practice driving here, which can better improve their driving skills and adapt to driving services under various complex road conditions.