 There are some machine translation evaluation survey works, where people introduced more details about what kinds of human evaluation methods they used and how they work, such as the intelligibility, fidelity, fluency, adequacy, comprehension and informativenes, etc.For automatic evaluations, the also did some clear classifications such as the lexical similarity methods, the linguistic features application, and the sub fields of these two aspects.For instance, for lexical similarity, it contains edit distance, precision, recall and word order; for linguistic feature, it is divided into syntactc feature and semantic feature respectively.