A technical analysis index, the technical meaning of KD index is "random". You should know that KD index is composed of k value and d value. The formula for calculating the index of K value is: today's K value =2/3 yesterday's K value+1/3. RSV in RSV formula is a "line random value", and the RSV index (relative to Williams' WMS%) is mainly used to analyze whether the market is overbought or oversold: RSV is higher than 80%. When RSV is below 20%, the market is oversold and the market is about to bottom out. At this time, you can consider entering the warehouse. For example, the closing price of the day is 20 yuan, the highest price in recent 9 days is 40 yuan, and the lowest price is 16 yuan. Then the index of "RSV No.9" on that day is [(20-16) ÷ (40-16)] ×100% =16.67%, which is less than 20%, indicating that the market is oversold. If the closing price of the day is 36 yuan, the highest price in the last 9 days is 38 yuan and the lowest price is 16 yuan, then the index of "RSV on the 9th day" of the day is [(36-16) ÷ (38-16) ]×100% = Generally speaking, the k value is continuous, but if there is no yesterday's k value, you can use today's RSV value or 50 instead. As can be seen from the formula, the value of k depends on RSV to a great extent. The calculation formula of D value indicator is: the current day: D value = 2/3; Yesterday's d value+1/3; The k value of the day is the same; If there is no original data of D value, you can use 50 or the RSV value of the day instead. In the securities market, the K indicator is usually called the fast indicator, while the D indicator is the slow indicator. K indicator has a quick response, but if it is only used as the basis for decision-making, it is easy to fail to keep up with the rapid changes in the market and make mistakes; D indicator is slow to respond, but it is more reliable because it is obtained by data regression in a certain period. The combination of K value and D value can express the following meanings: (1) When K value is obviously greater than D value, it means that K line breaks through D line upwards, which is an oversold market and investors should consider buying; Moreover, the greater the rising slope of K-line, the greater the profit reliability of investment. (2) When the K value is obviously less than the D value, it means that the K line falls below the D line, which is an overbought market and investors should consider selling. The greater the undershoot slope of K-line, the stronger the exit signal. (3) When the value of K is not much different from the value of D, it means that the market is in a relatively balanced period and can wait for the opportunity. KD is developed on the basis of WMS, so KD has some characteristics of WMS. When reflecting stock price changes, WMS is the fastest, followed by K, and D is the slowest. When using KD indicator, we often refer to K indicator as fast indicator and D indicator as slow indicator. K index is fast, but easy to make mistakes, and D index is slow, but stable and reliable.