I created a radar to scan the surroundings of the me entity in my demo,but I don't use the view entity.I use small panels to represent the models around.
When the me entity stands towards north in the level and there is a model in the east direction,then the small panel will appear right on the radar.When I turn to east,the model is in my front,so the small panel should appear up on the radar.
Then how can I make the panel change its position automatically when the me entity changes its direction in the level?

You could use vec_rotate to change the position you get from the scan so it's relative to the player's view.
Code:

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vec_rotate(temp_model_pos, my.pan);

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(Since you've already made the radar, I'm assuming you're familiar with Lite-C/C-Script.)