Five years. According to official website of Henan University of Technology, the master's thesis of Henan University of Technology is generally written in Chinese (except all majors in the School of Foreign Languages), with 30,000 words for liberal arts and 0/.5,000 words for science and engineering. The master's thesis of Henan University of Technology is kept for three to five years. Henan University of Technology, located in Zhengzhou City, Henan Province, is an excellent university jointly established by the People's Government of Henan Province and the State Grain Bureau, a key characteristic university in Henan Province, and an undergraduate teaching level evaluation by the Ministry of Education.