A small paragraph need correcting( my idea of a good college)

With beautiful campus, students can walk on scenic paths where they are able to escape from overwhelming academic stress, sit on the lawn and take a rest under the shade of a tree.

Almost perfect, you just "a" or "the" - "With a beautiful campus..." Although it's not necessary, I would say "On a beautiful campus..."

I found that library is one of the most important place in college.

Again, "a"s and "the"s are necessary. Also, "I have found" is better to describe your general opinion; "I found" is appropriate for a one-off discovery.

I have found that the library is one of the most important places in a college.

There would be quiet and have a rich collection of books , soft rays create a comfortable atmosphere in the library.

In english, you can't automatically use "here" or "there" in place of a noun as in many other languages.

Libraries are quiet and have a rich collection of books. Soft rays of sunlight can create a comfortable atmosphere in the library.

Thus students can focus on their study or read.

I believe that reading more book can broaden my horizons and my experience.

I believe that reading more books can broaden my horizons.

Saying "my experience" doesn't really add anything to the sentence; your meaning is conveyed perfectly just with the phrase "broaden my horizons".

Great work! This is strong evocative English. Well done.