The article analyzes why fuel oil prices in China go up and down. It looks at factors from inside China and other countries that affect these prices. The researchers used a special model to study the long-term and short-term relationships between fuel oil prices and things like crude oil imports and production. They found that light oil production in China has the biggest impact on fuel oil prices inside the country, while Dubai crude oil prices have the biggest impact from outside. This research could help China and other countries make better decisions about importing and using oil.