As an essential component of land evapotranspiration,canopy interception directly participates in the terrestrial water cycle.However,the significance of canopy interception on the global climate has long been underestimated.In this study,in order to explore the canopy interception's hydroclimatological effects,we examine the sensitivity of NCAR CAM-CLM coupled model to the changes of precipitation interception input parameter and canopy storage capacity parameter.The study results articulate the fact that the variations of interception can affect the land hydrology process and global climate.The canopy interception's modification alters the amount and portioning of global evapotranspiration,runoff,and 2 m temperature.The precipitation distributions between tropical land and ocean,and over mid-high latitude forests,are regulated by the interception-induce atmospheric circulation adjustment.We also indicate a potential link between canopy interception and vegetation photosynthesis,which varies with vegetation types.Upon comparing CLM4.5 simulations with GLEAMv3.0a data,the model canopy interception scheme overestimates the low PAI forest's canopy evaporation and underestimates the high PAI forest's,which in part lead to the bias of simulated evapotranspiration.Consequently,we induce a logic-curve interception equation into CLM4.5 and ameliorate the simulations of canopy evaporation and evapotranspiration over forests on the global scale.The new interception scheme reduces approximately 2%-5% of the evapotranspiration bias over Africa,the islands of Southeast Asia,the Indo-China Peninsula,eastern North America,and part of South America.It also lowers the canopy evaporation bias by 5%-30% over the forests in Africa,Southeast Asia and South America,as well as the boreal evergreen needle forests.