However, there are various "loopholes" in the actual application process of KDJ. For example, when the K value enters the overbought or oversold area, it often leads to hesitation and "passivation", which makes investors feel at a loss; When the exchange rate is stable and fierce in the short term or the market fluctuates too much, it is often difficult to buy at a high point and sell at a low point when using KD value cross-signal trading. In addition, according to personal experience, KDJ indicators often have the following analytical uses: J value is 1, especially if it is greater than 1 for three consecutive days, and ICBC speculates on foreign exchange online, the exchange rate often appears short-term head; If the value of J is , especially less than for three consecutive days, the exchange rate often shows a short-term bottom. It is worth investors' attention that J-value signals do not often appear, and once they do, the reliability is quite high. Around us, there are many experienced old investors looking for the signal of J value to master the best trading point of foreign exchange, and this signal can be said to be the essence of KDJ index. Individually, the value of k is around 2, and when the value of d crosses the right direction, it is a short-term buy signal; The value of k is about 8, and when the value of d crosses downward from the right of the value of d, it is a short-term selling signal. Higher-grade usage also includes: the value of k causes the phenomenon that the bottom is higher than the bottom, and at a low level below 5, when the value of d is crossed twice from bottom to top, the exchange rate will often increase greatly. The value of k is lower than the bottom, and at a high level above 5, when the value of d is crossed twice from top to bottom, the exchange rate will often increase greatly. When the k value is higher than 8 overbought areas, the short-term exchange rate is easy to fall back; Below 2 oversold areas, the short-term exchange rate will easily rebound upwards.