This article explains the concept of the Hooks programming model, which allows developers to insert custom code into the execution path of the system, application or library through predefined functions or code blocks, improving the scalability and customizability of the program. Uniswap V4 introduces Hooks, through which functions such as dynamic fees, on-chain price limit orders, and time-weighted average market makers can be implemented, enhancing the functions of DApp and the network effect of Uniswap.