KDJ is a random indicator \x0d\ principle: use the relative position of the current stock price in the recent stock price distribution to predict the possible trend reversal. \x0d\ algorithm: find RSV (immature random value) \x0d\RSV= (closing price-lowest price in recent n days)/(highest price in recent n days -\ x0d \ lowest price in recent n days) × 100\x0d\K line: M 1 day RSV. Parameter: n, M 1, M2 days, generally 9, 3, 3\x0d\KDJ indicator usage: the KD value of \x0d\KDJ indicator ranges from 0 to 100, with over 80% being overbought area, less than 20% being overbought area and the rest being wandering area; When the KD index forms a head-shoulder-top shape (multiple tops or multiple tops and bottoms) at a high or low position, a head-turning signal is issued; In the KD indicator, wearing D on K is a golden cross, which is a buying signal; When KD is at a high or low level, if the stock price trend deviates, it is also an early warning signal that needs attention; It is meaningless to wander or cross the KD value at 50%. \x0d\J index value is above 100 and below 0, which exceeds 100% and oversold below 10%. \x0d\ 1。 When the J-line breaks through the K-line from below (below 50%), it indicates that the weak consolidation pattern of the stock price may be broken and the stock price will move up in the short term. When the J-line continues to break through the K-line and move up quickly, it also breaks through the D-line, indicating that the mid-and long-term rise of the stock price has begun and can be bought. \x0d\2。 When the K-line, D-line and J-line run up rapidly at the same time, it shows that the stock price has entered a short-term strong pull-up market and should hold shares to be increased. \x0d\3。 When the J-line starts to turn down at a high level (above 80%) after a period of upward movement, it means that the stock price starts to adjust in the short term, and the short-term can be sold first.