Moneyflow is a mature technical index in the world. The calculation method is simple. For example, if the steel plate index rises within 9:50 minutes compared with the previous minute, the turnover within 9:50 minutes will be counted as capital inflow, otherwise it will be counted as capital outflow, and if the index has not changed compared with the previous minute, it will not be counted. Calculated once every minute and summarized once a day, the difference between capital inflow and outflow is the net capital inflow of the day.

The significance of this calculation method lies in: the volume generated when the index is rising is the driving force for the index to rise, and this volume is defined as capital inflow; The trading volume when the index falls is the power to push the index down, which is defined as capital outflow; The difference between the two forces on that day is the net force that pushes the index up after the two forces cancel each other out, that is, the net inflow of funds of the plate on that day. In other words, the capital flow measures the power to push the index up and down, reflecting people's pessimism or optimism about the industry.