This study aims to explore a set of literature to clarify the Content and Language Integrated Learning (CLIL) approach and determine if the evidence shows benefits in implementing the approach into the English for Specific Purposes (ESP) curriculum. The paper took a literature review approach and explored ten articles selected with specific criteria of being published within2014- 2020. The literature shows that the implementation of CLIL does have a positive output toward the teaching and learning process, especially for those who take English for Specific Purposes, such as in Vocational High Schools. The approach improves not only the linguistics aspects but also the non- linguistics aspect of the students' soft skills, such as high order thinking skills, problem-solving, enhanced communication, intercultural awareness, and motivation in learning. However, to meet the success of the implementation of CLIL in the ESP curriculum, some considerations and special requirements are needed. The two distinctive preparation are the syllabus for the curriculum and the readiness of human resources; the teachers. Before applying the CLIL, the two factors mentioned need mechanisms that will support the success of CLIL for the ESP curriculum in Vocational High Schools. The writer proposes a model to be implemented if the curriculum for Vocational High Schools is going to apply CLIL. Yet, it needs more researches in the future to make sure whether the model works well or needs more improvements.