To improve the situation where the comprehensive specialty English is not normative in college education, this paper examines 10 major courses from building environment and energy engineering specialty in Guangzhou University, and works out the number of specified necessary vocabulary for each course by giving consideration to both importance of the course and teaching requirements and class hours for specialty English course. Scrupulous statistics, analysis and selection on corresponding well-known foreign English original course books or monographs and domestic standards in English version are carried out, and then 1056 words and 106 phrases were chosen as the normative vocabulary, among which 295 words were chosen as the core vocabulary which students should fully master. Statistical result shows that, for students who have grasped the normative vocabulary, the average new words will be within 3.59% among the English articles corresponding to professional course; for students who can extend the part of speech, the absolute new words can be controlled within 3%, where students can read smoothly without a dictionary.