Here are some possible slogans, I hope you will like them:

1. panda power, win at the start!

2. Unite the pandas, and the competition is invincible!

3. Panda kids, the stadium is brilliant!

4. Panda spirit, wonderful game!

5. Fight for the championship, with panda's help!

6. Come on, Panda Team, let's go!

7. Happy competition, panda peers!

8. Pandas spread their wings and the stadium created miracles!

9. Panda Team, game glory!

10. The panda will win the competition!