Abstract:The soft soil is hot issue to be solved in littoral for freeway construction. The method,which considers the prestressed concrete tube pile combined with prefabricated strip drain to improve the soft soil,is put forwards by analyzing the investigation and field test. The prefabricated strip drain can be used as a draining channel in the compound foundation. So this method has great effects on in the soft soil treatment. At the same time,the mechanism of the method to improving the soft soil is discussed briefly. The in-situ cases show that the method is a good way to improve the deep soft soil,especially where the construction time for the project is relatively short.