Abstract: The realistic concern of mass historians is a kind of consciousness that closely links history with reality, actively intervenes in society and serves reality with mass history books. The realistic concern is the precondition for the public historians to set the goal of "writing history for the public", and then it guides the mass historians to "focus on content selection", selecting the writing content popular with the masses from the mass historical content: political history focuses on major historical events and patriotism, social history favors the content of public life, and personal history focuses on individual life experiences. The content selection of mass history books enriches the content of history writing, helps to enhance its social attraction, produces the positive effect of history returning to the public, and helps to realize the social function of history.