LEED-NC is a green building rating system for new construction developed by USGBC. Since it’s born in1998, LEED-NC has become the most famous green building rating system and made a big success in market expanding. Many other countries, including China, not only use experience of LEED-NC for reference to their own green building rating criterions construction, but also participate in the LEED-NC certification directly. But, as a green building rating system, one of it’s primary objective is to make clear what is the biggest problem in sustainable process. Since 1970’s oil crisis, resource shortage has become a common problem hindering the social and economic development of all countries and districts. Any green building rating system can’t avoid this reality. Using method of “example points+baseline point”, this article makes points statistics of “Energy & Atmosphere” category and it’s inner credits relevant to building energy saving. Finally, we verify LEED-NC’s performance in energy saving is not so good as people’s expectation. When using experience of LEED-NC for reference to our own green building rating criterion construction, we must be very cautiously. And when participating in LEED-NC certification directly, we must keep a conscious mind.