Abstract: The Cretaceous is a typical period for greenhouse climate in geological history and has become an important paleoclimate simulation period in international paleoclimate modeling community. This paper reviews a series of Cretaceous climate simulations, discusses the climate model's developing, the paleoclimatic boundary conditions and the experiment designs, and analyzes the impacts and feedbacks of atmospheric greenhouse gases, topography, oceans and terrestrial ecosystems on the Cretaceous climate system. These simulations focused on the major factors driving Cretaceous climate changes and the critical time periods of the climate change, and tested the internal and external forcing in the earth climate system and the feedback effects among various spheres of the earth system, thus providing us an understanding of the mechanism of greenhouse climate and an important scientific basis for projection of the future climate changes.

Key words: the Cretaceous, greenhouse climate, paleoclimate simulation, driven mechanism