The first kind of bottom quantity is the increase of quantity. Since the stock price is at a long-term low level, most of the chips must be set at its high level, and investors who have the funds to buy the stock are definitely rare. Therefore, the only reason for the large turnover is the reversal of the remaining main forces, so as to attract the follow-up of market funds. It is particularly important to note here that even if the fundamentals of the stock suddenly appear favorable, the main force is likely to be released in large quantities, because the introduction of favorable news will not lead to a large number of high positions and bloodletting. Therefore, the heavy volume at the bottom is generally caused by the main force in the session, which also shows that the main force of the stock has not "died". If through long-term observation, it is known that the stock has only the main force and no control banker, then as long as the bottom volume is not huge, the possibility of a strong market outlook is still great. If the stock is a banker with a high degree of control, then its future trend will be difficult to exceed the broader market. The second is the decline in trading volume at the bottom. There is less talk about the market decline, because it can't be profitable. But the decline will make us lose more, so it is necessary for us to pay attention to the decline. Since it is the decline of the bottom volume, it is actually the continuous decline after breaking through the bottom platform, so the timing of the volume is the key point of judgment. If the volume is increased as soon as it falls below 5%, it means that there are non-market trading elements, which may not be the main force's own reversal, but may be the handover of new and old main forces, or the large orders need to be released by the main force. In any case, at the beginning of the downward breakthrough, the volume will increase, at least there is hope of recovery in the future. If there is an infinite downward breakthrough first, then there will be a lot of market bills, especially many short-term rebound bills. However, this situation can generally be considered as the main loss, and the market outlook is worrying.