Inner disk: statistics on the number of transactions at the purchase price are added to the inner disk. Outer disk: statistics of selling price transactions are added to the outer disk. In other words: the inner disk is the sum of all buyers, the outer disk is the sum of all sellers, and the inner disk+the outer disk is the transaction volume. The strength of buying and selling power can be judged by the data of inner disk and outer disk. If the number of external disks is greater than the number of internal disks, the buyer is stronger; if the number of internal disks is greater than the number of external disks, the seller is stronger. Through the size and proportion of the number of external and internal disks, you can usually find out whether there are more active buying or selling, and often you can find the trend of the banker, which is a relatively effective short-term indicator. When using the outer disk and the inner disk, we should pay attention to the transaction situation of the stock price at the low and high levels and the total transaction volume of the stock. 1, after a long period of decline, the stock price is at a lower price, and the turnover is extremely shrinking. Since then, the volume of transactions has been moderate and heavy, and the external market has increased on that day, which is greater than the internal market, and the stock price will probably rise. 2. After a long period of rising, the stock price is at a high price, and the transaction volume is huge, so it cannot continue to increase. On that day, the number of internal disks is enlarged, which is greater than the number of external disks, and the stock price is likely to continue to fall. The turnover is 1, which helps to judge when the trend reverses and the price shrinks steadily. 2. The daily trading volume of individual stocks lasts for more than 5%, which is a sign that the main force is active. 3. Individual stocks rise infinitely after being pulled up by heavy volume, which is a sign that the main chips are highly centralized. 4, in case of sudden high huge long Yinxian, when the situation is unknown, should immediately go out, to prevent major negative lead to collapse.