Being a teacher in industrial 4.0 is demanded to adaptable to technological developments. This study aims to describe the understanding and ability of teachers of Vocational High Schools to use ICT in learning. This research is survey research. Research respondents were 142 Vocational Teacher of Computer and Information Technology expertise programs in South Sulawesi Province. The study was conducted from April to July 2019. Data were collected using a questionnaire that had previously passed the Validity and Reliability test. Data analysis was performed using descriptive analysis. The results showed that the teacher's understanding of hardware in the form of inputs, processes, and outputs was very well understood. However, they still lacked knowledge of artificial intelligence. The ability of teachers to utilize offline technology in learning is quietly better, but it still needs to be improved in terms of making mind maps, instructional videos, and graphic designs. The teacher is also familiar with the use of search engines, hotspots, e-mail, and LAN connected online. However, teachers have not optimized the use of databases, online learning, online video, online data storage and sharing.