The variability in summer North Pacific subtropical high (NPSH) has a significant impact on the monsoon and typhoon over the East Asia and the drought over the California. However, the future projection of the NPSH through the state-of-art climate models, particularly those pertaining to the tropical precipitation uncertainty remain unclear. In this research, we explore the connection between tropical precipitation uncertainty and the NPSH uncertainty through both fully coupled global circulation models from CMIP5 and a dry-core atmospheric primitive equation model. We have found that the biased condensational heating released through the tropic precipitation interacts with the NPSH through the Rossby wave train and the Kelvin wave response. The source of the tropical precipitation uncertainty can be potentially responsible for the uncertainty of the NPSH under the anthropogenic forced climate change.