In story telling, there is a line it slowly escalates up, at a point goes up to certain point then goes down fast, what is the highest point called?

It's the climax of the story. I suppose you already knew the answer but you just ask for the sake of asking.

it is called the climax of the story. 

The highest point in story called node ( الحبكة )  which shows the problem or where the story reaches  it peak then it goas slowly to the solution

I think you are talking about the "climax", the highest point of interest or suspense in a story.