买auction 的房子是怎么样一个过程呢？哪位可以讲讲？
是不是一下得要付清？

好象要先搞定mortgage，还有当场要付一定的deposite。

The problem with buying properties in auction is that you have to pay deposit which is non-refundable straight after winning the bid. It normally means you have to get everything sorted before going into the auction, such as survey (very importmant as some of the auction properties are having structural problems) and mortgage offer (at least agreement or promise). Also one thing you may want to consider is that properties in auction are normally A) from reposessions or having potential structural problem as I mentioned earlier or C) difficult to sell in open market. Price-wise, those auction prices are really for information only and really good properties would fetch far more than those.