How much of Japan's traditional culture comes from China ?
Whenever I read such a question, I ask myself, "What is he aiming at ?".
On the earth, can we find "the pure culture" which has never been influenced by the other culture ?
I am so fool high school student that I cannot find "the pure culture" in the world.

A new culture originates in encounter between the different cultures. It is brought up with the tender care for a long time and becomes a highly developed culture.

If you are interested in cross-cultural comparison between Japan and China, I will advise you to read the books written by Wang Min王敏.

“意”の文化と“情”の文化―中国における日本研究 中公叢書
http://www.amazon.co.jp/exec/obidos/...779759-6113064

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It is said that in ancient times there were 4 culture areas in the world.
Old Japan related to the Chinese culture area.
(Chinese culture is also made by many different ethnic cultures.)
Some yearly events in Japan originated in encounter between old Japanese culture and old Chinese culture. They were imported as events of the court life and transformed the characters in Japan. Today, They are different from Chinese ones.