Features of Military English Science and Technology (MEST) have been introduced, and accordingly its translation principles are put forward. At the same time, difficulties in the translation of MEST are analyzed, that is, a large number of professional terms, abbreviations and old words with new meanings making it difficult for translators and interpreters to understand. Meanwhile, MEST are not open to the public, which also reduces translators‘ chances to learn professional materials, resulting in underdeveloped translation studies. To be engaged in translation and related research on MEST, translators must have excellent English language skills, extensive scientific knowledge and solid Chinese language skills to ensure the accuracy of information transmission and to enhance the readability of the translation.