Contrarian trading system is a system that trades against the mainstream trend and long-term trend of the market. It is generally believed that the best way to judge the mainstream trend is to use the weekly K-line instead of the daily K-line. Going against the trend, as the name implies, is a strategy in the opposite direction. The contrarian system has existed for decades, but it has not been welcomed by small and medium-sized investors, and its neglect is caused by the nature of investors. Contrarian trading is trading against the mainstream trend in a short period of time or in the middle period. In essence, it is to hold the opposite position when the market is oversold or overbought. As a contrarian trader, you usually need to have long-term rich market experience. Generally speaking, oscillating traders, day traders and short-term traders are the main body of contrarian trading. The key to the success of contrarian trading lies in contrarian index, special K-line chart and enough trading experience. Contrarian traders usually make predictions before the trend changes. Compared with trend trading system or breakthrough trading system, contrarian trading system is a kind of reverse trading, so it is usually accompanied by greater trading risk. Therefore, as a contrarian trader, you must have a good stop-loss quality or stop-loss strategy. This is because the mainstream trend is often unstoppable, while the contrarian trading opportunity is fleeting, with a more serious speculative tendency, and it is very likely that there will be a continuous direction error. Statistics show that the contrarian trading system is effective in 20% cases.