Precious metals mainly refer to eight metal elements such as gold, silver and platinum group metals (ruthenium, rhodium, palladium, osmium, iridium and platinum), among which gold is particularly important. Most of these metals have bright colors and strong chemical stability, so they are not easy to react with other chemicals under normal circumstances. Qingdao Guo Jingui Metal Trading Center pointed out that since the State Council issued Document No.38 earlier to rectify the trading market, the central bank and other five ministries and commissions jointly issued a document prohibiting any institution or individual except Shanghai Gold Exchange and Shanghai Futures Exchange from setting up a gold exchange or gold trading platform. In precious metals investment, there are mainly spot silver and some physical gold that can be traded on trading platforms, and there are many illegal platforms, such as many underground markets such as London gold and London silver, which are quoted in US dollars. Over the years, there have been many fraud cases, which require investors to be cautious.