Language skills integration refers to teaching four aspects of English skill and treats it as one of two or more interrelated skills. Language training center (LTC) is a place for English language training both for employees, students and teachers. This research uses a qualitative research design that aims to identify the teaching methods applied by LTC’s teacher in teaching the Integrated Language Learning and to find out the obstacles faced by LTC’s teacher in teaching by using Integrated Language Learning. The participants of this research are three teachers of LTC a private university in Yogyakarta who taught for two years or more to make researcher get more information and knowledge and have master degree due to the existence of laws and regulations No. 4 of 2005 concerning teachers and lecturers that the lecturer must have academic qualifications higher to teach university students.The result showed that teaching method used by LTC’s teacher was theme-based instruction and some learning activities that implemented such as games and challenges, role play and presentation and personal approach. Furthermore, the lack of time, demotivated students and lack of learning facilities were some obstacles experienced by teacher in implemented theme-based instruction.