This research aims to explore characteristics of ‘engineering writing’(often called, ‘technical writing for engineers’) as well as analyze texts written in the related field based on language register. Three main components utilized in this study are concerned with ‘field of discourse’, ‘mode of discourse’ and ‘tenor of discourse’. It is generally known that ‘engineering writing’ is related to two key competencies. The first is the ability to understand technical language in related fields and the second is being able to express their knowledge in a clear, concise, and coherent way. Even though engineers are a great of technical knowledge and technical people, that does not necessarily mean they are good enough technical writers to convey important outcomes. Recently, domestic and overseas studies regarding engineering writing and related texts have focused on WAC or WID. However, there is still a lack of systematic researches on education contents, teaching methods, and case studies about lecture practice in the field of engineering writing. Therefore, various studies and discussions are still needed. The main results of this study are as follows. Firstly, various textuals related to ‘field of discourse’ could be extracted as the IMRAD format, discourse purpose and technical terms, etc. and their more sophisticated analysis is required. Secondly, according to ‘mode of discourse’, engineering writing and texts belongs to the text type with literacy, opposed to orality. Third, regarding ‘tenor of discourse’, engineering texts made use of the relationship between the addresser and the addressee, in terms of ‘formal’ and ‘impersonal’ distinctions. Through the results of this study, it is recommended that extended engineering texts should be analyzed in more detail.