本文旨在探討清代道光年間，由龔自珍與魏源所掀起的「經世致用」之理念，與儒家所強調的「外王」之理路有何差異，進而釐清其「致用」意識與清初顧亭林所強調的「以經治世，以經救世」的「經世」觀之異同。並由此指出，「經世致用」觀念內在理路的發展，隨著世變和外在挑戰的不同，而有所更變。是以，十九世紀初葉的「經世」觀，已成了一個相當獨立的意識，它不再以經書議政的形式出現，而是以實務的行動，貫經術與政事為一體，以實現「致用」的目的。在此，本文也通過對龔自珍與魏源的「經世」思想進行比較，探析在同一時代中，他們二人在「經世致用」回應向度上的差別，進而，也對這時期的「經世致用」觀念進行詳細的檢討。

This article aims at discussing Gong Zizhen and Wei yuan ideology of the representation of philosophical practice in mid Qing Dynasty, differentiating the Confucian school's ideology of "Wai-wang"; clarifying Gong and Wei's ideology of putting things into use; comparing the similarities and differences raised by Gu tingling in Early Qing Dynasty that using philosophy to manage and rescue the world; elaborating the development and changes of the representation of philosophical practice as the time and the challenges are changing. Entering world has become anindependent ideology in early Nineteenth Century. It is no longer appeared as the form of discussing politics on the written books, but using concrete action, integrating into classics and politics, to achieve the goal of putting things into use. This article also compares Gong Zizhen and Wei yuan ideology of entering world, discussing the differences of their ideology of the representation of philosophical practice; reviewing the ideology in the same period.