Abstract: In the book On the Jewish Question， Marx launched his first criticism towards Bruno Bauer， which marked the beginning of Marx's practical philosophy. This origin indicated that the change of practical philosophy has started， but it is far from completion in that Marx's concern about the Jewish question is still spontaneous rather than conscious. However， Marx indeed criticized Bruno Bauer's thought based on the resources of speculative philosophy. Having started shows that Marx realized that the Jewish question is a secular issue rather than a theological one. The Jewish question needs to be solved through the critiques of the civil society.

Key words: practical philosophy, On the Jewish Question, beginning of practical philosophy