股票质押不同于其他权利质押，它是以股票为标的物，其担保功能大小的直接依据是出质股票交换价值的大小。而股票交换价值为一变值，以其价值为基础，同时受市场供求，银行利弊，股票质押期限因素影响，因此同其他质押相比有很大的风险性。证券公司拥有的股票虽然变现能力强、 Stock pledge is different from pledge of other rights, it is based on the stock of the object, the size of the guarantee function is directly based on the size of the pledged stock exchange value. The value of stock exchange is a variable value, which is based on its value. At the same time, it is subject to the market supply and demand, the pros and cons of banks and the term of stock pledge. Therefore, it has great risk compared with other pledges. Although stocks owned by securities companies have strong liquidity,