Guided by Charteris-Black's Critical Metaphor Analysis, this study analyzes the English version of Premier Li Keqiang's Reports on the Work of the Government (2018-2022), explores the types of conceptual metaphors in the reports, and discusses the hidden ideology and the purposes of using these metaphors, with a view to ultimately provide a certain reference value for the construction of Chinese political discourse. Finally, this study finds that there are 3 major metaphors and 5 minor metaphors in the 2018-2022 government work reports. The major metaphors include journey metaphor, war metaphor and building metaphor, while minor metaphors include anthropomorphic metaphor, machine metaphor, water metaphor, plant metaphor and other metaphors. Among them, journey metaphor is used for elaborating national policies and guiding the public to achieve political goals; war metaphor can stimulate people's feelings and contribute to the development of the country in all respects; building metaphor aims to arouse the public's enthusiasm and develop positive value orientation.