Decentralized Finance or, DeFi, refers to various decentralized protocols built on the blockchain network (mainly the Ethereum network) which are aimed to build an open financial system with transparency, accessibility and inclusiveness. The components of DeFi include smart contracts, protocols, decentralized applications, digital currencies, and more. DeFi is also known as “money lego”, it has entirely license-free access, financial applications can be built, connected and used without restrictions. DeFi aims to use smart contracts to replace traditional institutions in Financial Field, allowing users to enjoy financial services at a lower cost, and improve the operational efficiency of the entire financial system, reduce operational costs. At the same time, DeFi should create a global open borderless financial system, so that everyone can trade freely and transparently. DeFi projects have two main advantages over traditional centralized financial systems: 1. Individuals with demand