The purpose of this study is to evaluate the cloud-radiation interaction associated with precipitation physics in the National Centers for Environmental Prediction (NCEP) Global Spectral Model (GSM). Four experiments with the Weather Research and Forecasting (WRF) Single-Moment 1-class (WSM1) and 3-class (WSM3) Microphysics schemes for stratiform precipitation processes, and the Simplified Arakawa-Schubert (SAS) scheme and National Center for Atmospheric Research (NCAR) Community Climate Model (CCM) scheme for convective precipitation processes are carried out on a single column model and seasonal simulation framework. The impacts of the ice content on the radiation processes are also investigated. Furthermore, the relationships between relative humidity, cloud amount and cloud water are investigated by observational analysis to understand the uncertainty of cloudiness parameterization intimately associated with cloud-radiation feedback. The revised formula for cloud fraction will be suggested to improve the cloud-radiation feedback.