There are two kinds of risks closely related to forced liquidation: puncture and abandonment. The so-called warehouse penetration refers to the risk that the customer's rights and interests in the customer's account are negative, that is, the customer not only loses all the margin in the account before opening the position, but also owes money to the futures company. In the case that futures companies strictly implement the debt-free settlement system on the same day, cross-position events are not common, but they are also heard from time to time, because in the case of violent market fluctuations, customers' positions may be blocked on the stop-loss board quickly. If the next day, under the action of inertia, the market opens sharply, and the customer is in Man Cang the day before, there may be a warehouse-breaking event.

It is worth pointing out that after the stock index futures simulation trading begins, the media sometimes report that "customers can still trade xx million", and the penetration described here is not true, because these media mistakenly regard the situation that the available funds of customers are negative in the stock index futures simulation trading as penetration, and at this time, the customer's rights and interests are still positive, but the available funds are negative, and there is no penetration.