Star rating is one of the most commonly used evaluation methods in the world, and it is most commonly used in the quality evaluation of hotels and restaurants. Many goods or services adopt star rating methods. In addition, the concept of star rating extends to spoken language or literature and becomes a description of rank. Use the number and color of stars to indicate the level of tourist hotels. The stars are divided into five grades, namely, one star, two stars, three stars, four stars and five stars. The higher the star rating, the higher the grade of tourist hotels. Four-star hotels have higher grades.