NFT stands for non-fungible Token and non-homogeneous Token in Chinese. Our common tokens (such as BTC, ETH, etc.) are homogenized, there is no difference between each BTC (like 2 notes of 100 RMB), they are interchangeable and divisible. The important feature of NFT is that each NFT has a unique and unique identifier, which is not interchangeable and the smallest unit is 1 and indivisible. In cryptokitties, each cat corresponds to an NFT on the chain, with a unique ID, genes, and, more importantly, an independent value. The secondary crypto cat market is very active, with the most expensive cat selling for 750,000 RMB, proving the value of virtual goods in the form of NFT. In the blockchain world, we have cryptocurrencies to represent the assets of money, and naturally need a medium of value to represent non-monetary assets, so NFT came into being. Thanks to the decentralized, immutable, cryptographic rights determination and other characteristics of blockchain, NFT solves a series of problems of assets in the real society: 1) better liquidity, can be efficiently and atomically traded; 2) Cryptography confirms rights and cannot forge assets. NFT also provides features that cryptocurrencies cannot, such as representation of negative assets (liabilities), proof of identity or equity, and virtual items. NFT fills the gap in crypto assets, allowing us to bring assets with independent value into the crypto economy and gain the protection of blockchain. NFT can be used to represent digital assets themselves, as well as vouchers for some special purposes (real estate certificates, passports, tickets, coupons, etc.). Therefore, it can be used in a wide range of scenarios, such as collections, game items, digital art, event tickets, domain names, and even ownership records of physical assets.