(1) In practice, some short-term customers often use the minute indicator to judge the market outlook and decide the trading opportunity. In the T+0 era, 15 minutes and 30 minutes KDJ indicators are commonly used, and in the T+0 era, 30 minutes and 60 minutes KDJ are used to guide entry and exit. Several empirical rules are summarized as follows: (a) If the KDJ is at 20 in 30 minutes, if the daily KDJ indicator is also at a low level, it may be an intermediate market. However, it should be noted that it is only effective when the K value is greater than 20% of the D value after the intersection of the K value and the D value. (b) If KDJ turns down above 80 in 30 minutes, the K value goes below the D value, and falls below 80, 60 minutes, KDJ just passes 20 and is less than 50, indicating that the market will turn down, and after KDJ bottoms out in 30 minutes, it may continue to rise; (c) If the KDJ is above 80 in 30 minutes and 60 minutes, and the K value crosses the D value at the same time after a long period of consolidation, it indicates that it is necessary to start downward adjustment of the market for at least 2 days; (d) If the KDJ falls below 20 in 30 minutes and turns upward, and the KDJ is still above 50 in 60 minutes, it is necessary to observe whether the K value will effectively exceed the D value (the K value is more than 20% of the D value) in 60 minutes, and if it is effective, start a new round of upswing; If it is invalid, it means that it is only a rebound in the process of falling, and it will continue to fall after the rebound; (e) If KDJ stops falling before 50 in 30 minutes, and KDJ just crosses upward in 60 minutes, it means that the market may continue to rise again, and it is only retreating at present; (f) The deviation of KDJ in 30 minutes or 60 minutes can also be used as a basis for judging the top and bottom of the market. For details, please refer to the previous discussion on daily deviation; (g) In a super-strong market, the KDJ can reach more than 90 in 30 minutes, and the high position repeatedly appears invalid crossover. At this point, the focus is 60 minutes of KDJ. When KDJ crosses downward in 60 minutes, it may trigger a short-term deep retreat; (h) During the plunge, KDJ can be close to zero within 30 minutes, but the overall trend is still declining. At this time, we should also look at KDJ in 60 Minutes. When KDJ effectively crosses upward within 60 minutes, it will trigger a strong rebound.

(2) When the market is in a very strong and weak unilateral market, the daily KDJ is repeatedly passivated, and the medium and long-term indicators such as MACD should be used instead; When the stock price fluctuates greatly in the short term and the daily KDJ response lags behind, CCI, ROC and other indicators should be used instead; Or use the SLOWKD indicator.

(3) The weekly KDJ parameter is generally 5, and the weekly KDJ index has obvious hints for bottoming out and peaking. Accordingly, band operation can save a lot of hard work and strive for maximum profit. Need to be reminded that the weekly J value generally rises at the V-shaped single bottom in the oversold area, indicating that it is only a rebound market, and the formation of a double bottom is a reliable intermediate market; However, the J value may drop sharply at the top of the overbought area. At this time, we should be vigilant and judge comprehensively with other indicators. However, when the stock market is in a bull market, the stock price will still rise sharply after the J value is overbought for a period of time.

Application essentials: KDJ index random index is sensitive and fast, and it is a good technical index for short, medium and long-term trend band analysis. Generally speaking, for people with large funds and large bands, the KDJ value of the month is gradually absorbed when it is low; When the main force operates at ordinary times, it pays attention to the position of weekly KDJ and judges the high and low points of the mid-line band, so the daily KDJ is often passivated unilaterally; Daily KDJ is extremely sensitive to the direction of stock price changes and is an important method of daily trading. For short-term travelers in small bands, 30 minutes and 60 minutes KDJ are important reference indicators; 5 minutes and 15 minutes KDJ can provide the best time for investors with designated trading plans to place orders immediately. The default parameter commonly used in KDJ is 9. As far as my personal experience is concerned, the short-term parameter can be changed to 5, which not only makes the response more agile, rapid and accurate, but also reduces the passivation phenomenon. Commonly used KDJ parameters are 5, 9, 19, 36, 45, 73, etc. In actual combat, different periods should also be comprehensively analyzed, and the short, medium and long trends should be clear at a glance. If there are resonance phenomena with different periods, it shows that the reliability of the trend has increased. There are four main points in the actual judgment of KDJ indicators:

(1) K line is the quick confirmation line-the value above 90 is overbought, and the value below 10 is overbought; Line D is a slow trunk line-the value above 80 is overbought and the value below 20 is oversold; J-line is a direction sensitive line. When the j value is greater than 100, especially for more than 5 consecutive days, the stock price will at least form a short-term head, while when the j value is less than 0, especially for more than several consecutive days, the stock price will at least form a short-term bottom.

(2) When the value of k is gradually greater than the value of d, the graph shows that the K line crosses the D line from below, indicating that the current trend is upward. Therefore, when the K line breaks through the D line on the graph, it is a buy signal.

In actual combat, when the K line and the D line cross below 20, the signal of short-term buying is more accurate at this time; If the K value is below 50, the D value crosses from bottom to top twice, forming a "W bottom" shape with the right bottom higher than the left bottom, and the stock price may have a considerable increase in the afternoon.

(3) When the value of k is gradually less than the value of d, the graph shows that the K line crosses the D line from above, indicating that the current trend is downward, so when the K line crosses the D line downward on the graph, it is a sell signal.

In actual combat, when the K line and the D line cross downward above 80, the short-term selling signal at this time is more accurate; If the value of K is above 50 and the value of D breaks down from top to bottom twice, forming an "M-head" shape with the right head lower than the left head, the stock price may drop considerably in the afternoon.

(4) It is also a practical method to judge the top and bottom of the stock price by the trend of KDJ deviating from the stock price: (a) The stock price has reached a new high, but the KD value has not reached a new high, which belongs to the top deviation and should be sold; (b) The stock price is low, but the KD value is not low, which belongs to the bottom deviation and should be bought; (c) The stock price has not reached a new high, but the KD value has reached a new high, which belongs to the top deviation and should be sold; (d) The stock price is not at a new low, but the KD value is at a new low, which is a bottom deviation and should be bought; It should be noted that the method of judging the deviation between the top and bottom of KDJ can only be compared with the KD value of the previous wave of high and low points, and can not be compared by jumping over.