The leader changed my job. I need to talk to him and transfer me back. What should I say?

In fact, if you think this leader is reasonable, you can come straight to the point, talk about your ideas, don't beat around the bush, make it clear why you want to go back, and make it clear why you don't want to be in your current position, so that you can almost know the pros and cons, but the leader may have his ideas to let you come to this new position, which may be beneficial to your development.

If the leader doesn't like more direct expression, you can chat with him first, briefly talk about your work in recent years, and let him feel that you have done a good job in your original post, and if you still work in your original post, you will make greater contributions, and so on. ...

If you have the conditions, you can ask people around the leader why they want to change jobs. So you can talk to the leader in a targeted way.