How US terrorist attacks on Sept. 11 influences US entertainment industries development as well as I shall explain how and why US terrorist attacks on Sept. 11 and US entertainment industry has indirect or direct cause and effect relationship. US entertainment industry has high market share in overall industries. entertainment industry may include: hotel, tourism, movie, music, sport, publishing, electronic playing game etc. these main several aspects. Human must need any kinds of entertainment, for example, liking reading people who must go to book stores or enter e-publishing stores to buy any paper books or e-books to read. Otherwise, like sport or enjoyment tourism people, who must choose to spend time to play any football, basketball or swimming etc. different kinds of sports or going to travel agents to pay money to buy air tickets to choose anywhere to travel. Hence, due to human needs any kinds of entertainment to enjoy our lives, instead of working. If any entertainment businessmen can predict whether what factors will influence general entertainment consumers' entertainment choices change as well as they can predict why and how their entertainment consumption of kinds change. Then, their entertainment businesses can have much accurate prediction to any kinds of entertainment consumers' behaviors. The final chapter explains how and why terrorism attack influences oil price changes and traveller behaviors to global airline industry.