The hero Simon in Robert Walsers' novel Brothers and Sisters of Tanner does not seek his own career development; he prefers to walk in the nature.Through his observation,perception and reflection,Simon realizes that jobs in the modern society constrain not only the body,but also the spirit of people.So he walks a lot and changes jobs in order to free his body and spirit from the control.Simon's behavior embodies his attitude "I walk so I am".Instead of spirit,body becomes the key to subjectivity of a person.