Two years. According to the query of official website of Petroleum Industry and Commerce College, the selection of famous teachers in Qingdao universities is held every two years, aiming at further promoting the construction of high-quality, professional and innovative university teachers, improving teachers' ability and quality, expanding the connotation of teachers' development, stimulating the enthusiasm and creativity of front-line teachers, and constantly improving the level of education and teaching and the quality of personnel training.