Under the trend of global industry development, the growing consumer preference for the over-the-top (OTT) video streaming services is having a disruptive effect on traditional television scheduling, ratings, advertising, and cable TV subscriptions. In this critical moment, the ability of media planners to understand audiences across the various viewing alternatives becomes an important issue. This study is to examine the business models of dominant OTT players and the approach to measure audiences and video rating. The literature review, cases analysis, in-depth interview and focus groups are employed as the main research methods in this project for answering to which extent between the rating mechanism for OTTs and their business models.