The Millennials has become the key that become the foundation of the company. The aim of this study is to see which is the most effective mechanism between work-life balance & work-life integration which will boost up the work & potential of them. First, we see the basic essence between that two variables. What is the contrast point between the two? From this explanation, it will be seen the effectiveness of which method is more engaged to millennials. This study was conducted using a literature review method. In millennials today, work-life integration becomes a path chosen as long as the responsibility is complete. Even so, not all the companies could use the work-life integration concept, instead use work-life balance concept. This is due to the difference of the job function that couldn't use flexible working hours that use in work-life integration system.