在二手房交易市场日益火爆的今天，很多金融机构为了占领这一市场，扩大其金融服务领域和提高收益，往往与二手房交易的中介机构签定购房按揭协议，从而不但能够达到增收的目的，同时也使二手房买主能够享受国家政策性贷款的优惠利率。一般的做法是：买房人在确定要购买的房屋 Today, many second-hand housing market is increasingly hot today, many financial institutions in order to occupy the market to expand its financial services and increase revenue, often with second-hand housing intermediary agencies signed a purchase mortgage agreement, which will not only be able to achieve the purpose of increasing revenue, It also enables second-hand buyers to enjoy preferential rates for state policy loans. The general approach is: buy a house to determine the purchase of the house