实用型的英汉机器翻译系统要面向科技文献的翻译，必须解决好基本词典和专业词典的关系。本文结合英语词汇学的理论，根据多年的英汉机器翻译的上机实践，提出以基本词典为主，专业词典为辅的原则，比较理想地处理了两部词典的协调关系，从而在一定程度上提高了系统的译准率。 Practical English-Chinese machine translation system for translation of scientific literature, we must solve the basic dictionary and the relationship between professional dictionaries. According to the theory of English lexicology and based on many years of machine translation practice of English-Chinese machine translation, this thesis puts forward the principle that basic lexicon is the main supplement and professional lexicon is supplemented, and the coordination relationship between the two dictionaries is ideally handled. Therefore, to a certain extent Improve the system’s translation rate.