According to Hu Jin-tao's scientific development theory, this paper emphasizes "humanism" and its embodiment of the nature of socialism, the advancement of "Regulating in both macro and micro ways" in order to combine the advantages of socialist system with market economy, the significance of Deng Xiao-ping's "Developing theory" to achieve an internal unity of economic regularity and nature's regularity and promote a harmoniurs development of man and material, economy and nature. We hope this paper could contribute to people's understanding of this modern version of Marxism.