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Assessment system of implicit environmental impacts was established including environmental impact indicator, resources consumption indicator and energy consumption indicator. The quantification of environmental impact indicators is based on the life cycle assessment system of the Society of Environmental Toxicology and Chemistry (SETAC) and the evaluation software BEES. Normalization reference values and weights of 12 categories of environmental impacts were identified, and the environmental impact indicators in the phases of raw material extraction, transportation, manufacturing, use and end of life were analyzed. By analyzing the environmental performance of a university refectory as a case study, it is demonstrated that human health, global warming and acidification are the first three environmental impacts in 12 categories. The total implicit environmental impact load per square meter of this project is 18.448×10~(-2) standard human equivalent weight. Moreover, 97.3% of total environmental impacts occur in the phase of raw material extraction.