The form keeping of the object is a problem that each field often faces; there are different kinds of the form keeping. Firstly, it is the form keeping of the rigidity object, secondly, it is the form keeping of plasticity object, and the third kind is the form keeping of the non- solidifying object, i.e. the permafrost. This text discusses the form keeping of the non- solidifying object from the transform of the condition based on the Extension set and the method of the extension transformation, in order to solve the problem that the actual project faces. This text describes some concept of the form keeping, and gives some examples for relevant application.