Lan Yu was a mainland film. The preparation process for its filming in the mainland of China was as follows: 1. Deciding the shooting location and role: The movie Lan Yu was originally planned to shoot in Beijing City, but due to some reasons, it was finally chosen to shoot in Chongqing City. In addition, some of the roles in the movie were also played by Chongqing people, such as the male lead Liu Ye and the female lead Zhu Yawen. 2. Search for the script: The script for the movie " Blue Universe " was co-written by two directors, Liu Zhenyun and Cao Baoping. The script was originally written in Beijing, but it was finally finalized after many changes and improvements. 3. Find suitable actors: The cast of the movie "Lan Yu" includes Liu Ye, Zhu Yawen, Ning Jing, Hu Jun, Chen Kun, and other capable actors. These actors all approved of the script and participated in the pre-filming audition and training. 4. Confirm the shooting time and progress: The shooting of the movie Lan Yu lasted for nearly eight months and officially began on July 1st, 2005. 5. Establishment of filming sites and facilities: The film Lan Yu has set up filming sites in Chongqing City, including the People's Square in Chongqing City and the Liberation Monument in the Yuzhong District of Chongqing City. In addition, special equipment and props were used to shoot some special scenes. 6. Release and Promotion: The movie Lan Yu received very high reviews and box office results after being released in the mainland of China. Since then, the film has won many international awards and received widespread attention around the world.