Time-space trading is a thinking method based on time-space philosophy, which is specially used to study the investment and trading behavior of financial capital market. The most basic point of view of spatio-temporal trading is that time is the real factor to promote the evolution of market conditions. Time is the internal reason for the uncertainty of market conditions and the essence of the development and change of market conditions, while the space for price changes is only the external phenomenon of market conditions. Therefore, only the time factor is the basic measure to examine investment opportunities and consider price changes. As we know, almost any technical analysis diagram has not only price coordinates, but also time coordinates. The transaction price of the transaction object is constantly changing with the advancement of trading time. Once the trading hours stop, the price changes will also stop. Therefore, any trading theory or technology that only studies the law of price change and ignores the time factor is imperfect in space-time trading, and it is doomed to lose money to guide investment trading. This also explains the strange market phenomenon that most investors who rely on traditional trading theory and use traditional technical analysis or value analysis tools to trade stocks, securities, futures and foreign exchange markets are losing money. The theory of spatio-temporal trading is based on the following understanding of capital market: the phenomenon of market quotation is the external reflection of market transaction ontology (internal function). Market transaction ontology (intrinsic function): release risk and discover value. Market transaction ontology is a unity of time and space, and transaction time pushes price space, and time is the basic factor that produces market risk and transaction profit and loss. According to the theory of spatio-temporal trading, the ontology of market trading must be grasped through market phenomena. We should actively avoid market risks and passively accept protection and profit. We must comprehensively consider time and space and seize the opportunity to trade rationally. We must grasp the trading opportunity subjectively and handle the trading procedure scientifically. The key point of time-space trading tactics is trading thinking: actively avoiding market risks and passively accepting protected profits. Trading strategy: subjectively judge the opportunity to enter the market and objectively verify the profit expectation. Trading mode: time period controls trading, and space price prevents risks. Trading principle: use what you see; Follow the general trend and make continuous progress. Space-time trading theory explains the fundamental problems of market quotation and investment trading behavior; Spatio-temporal trading system can be used as the basic structural framework of all trading systems or trading software; Space-time trading tactics provide investors with a set of effective trading tools that are more convenient to use and more powerful. As long as you understand the basic ideas and principles of time-space trading, you will naturally understand the mystery of profit and the reasons for loss in capital market investment transactions.