Reseting remote to a certain commit
Assuming that your branch is called master both here and remotely, and that your remote is called origin you could do:
git reset --hard <commit-hash>
git push -f origin master
However, you should avoid doing this if anyone else is working with your remote repository and has pulled your changes.
In that case, it would be better to revert the commits that you don't want, then pushing as normal.
Update:
you've explained below that other people have pulled the changes that you've pushed,
so it's better to create a new commit that reverts all of those changes.
There's a nice explanation of your options for doing this in this answer from Jakub Narębski.
Which one is most convenient depends on how many commits you want to revert, and which method makes most sense to you.
Since from your question it's clear that you have already used git reset --hard to reset your master branch,
you may need to start by using git reset --hard ORIG_HEAD to move your branch back to where it was before.
(As always with git reset --hard, make sure that git status is clean, that you're on the right branch
and that you're aware of git reflog as a tool to recover apparently lost commits.)
You should also check that ORIG_HEAD points to the right commit, with git show ORIG_HEAD.
總結：
如果你推送到remote的commit沒有被其他人pull過，那么你可以使用
git reset --hard <commit-hash>
git push -f origin master
來撤銷之前提交的commit
但是如果有其他人同步過你的push，那么你可以在本地使用revert來還原你提交的commit，然后生成一個新的commit然后再推送到遠端