Abstract: As a classical soft rock,mudstone is easily affected by external factor such as water or long-time exposed,etc,and then its physical and mechanical properties will be changed.As an important engineering property,the determination method of bearing-capacity is one of the most important tasks.For soft rock,a variety of testing method should be adopted to confirm the bearing-capacity of foundation.In this paper,the investigation experience of a nuclear power project in Neogene mudstone area is used to analyse and compare the variety method which usually used to gain the bearing-capacity of soft rock foundation.