There is no point in doing sth. 这个句型中point意为：the purpose or aim of something。句子通常译为做某事是没有意义的，做某事是达不到任何目的的。非正式语体中介词in可以省略。句子变为 There is no point doing sth.  There is no point to do sth是不规范的说法，应该避免。

the freedictionary:

If you say that there is no point in doing something, you mean that it has no purpose or will not achieve anything.

There's no point in talking to you if you won't listen.

类似的句子还有There is no good/use (in) doing something. 做某事是没有益处/用处的。介词也是用in，非正式语体in可以省略。