I hit a pothole and rear tire blow out but the rim is ok.
And, my seat post was turn 5 degree right side and I thought I need to re tight up a clamp.
However, it wasn't teh clamp. it was seatpost where carbon meet metal part.
It is very little turning right and left side.

Can I fix it or need to buy a new one?
If I can fix, how I can repair the joint?

thank you guys.

Same thing happened to me last year. I warranteed the crappy Cannondale post and while I was waiting for it to came back, I got a Ritchey WCS post and haven't looked back.

Do yourself a favour and get a good one-piece aluminum post (Thomson, Ritchey, etc). It's not THAT much heavier than carbon, and I've noticed no difference in ride quality between the two posts I've had.

If warranty won't work you could glue it with JB Weld. Framebuilders commonly use it to glue carbon stays to the frame so I can't think of any reason you can't use it too.

thank you. guys.