本文从 2 0世纪经济社会发展的现实出发 ,研究社会必要劳动时间的二个基本涵义及在现代社会沿着马克思的研究思路继续前进而引出的四个拓展涵义 ;以马克思关于社会必要劳动时间的两个基本涵义及在现代社会的四个拓展涵义为依据 ,探索马克思社会必要劳动时间对现代经济发展的指导作用及其重大的现实意义。 Based on the reality of economic and social development in the 20th century, this paper studies the two basic connotations of the necessary social working time and the four expanding meanings that the modern society leads along with the research ideas of Marx. With Marx’s reference to the necessary social working time Two basic connotations and the four expanding connotations in modern society to explore the guiding role of socially necessary working time in Marx to the development of modern economy and its great practical significance.