Vespa velutina is a predatory hornet distributing in SouthEastern part of Asia and became invasive in early 2000s; invading into Korea in 2003 and France in 2004. Its distribution pattern showed typical species-invasion curve type with slow progress in the beginning and rapid expansion on ward. We determined the geographic spread of V. velutina with CLIMEX modeling. The model analysis indicates that the ecoclimatic indices (EI) increased as the projection year increased based on RCP8.5 scenario. Then the predicted EI values were further regressed with the field collected data from 2018. Vespa velutina population sizes were estimated from 230 points of sampling over the country and the sampling data were correlated with predicted EI values. The results indicated that partial contribution of the climate factors for its abundance. Also this could be an usual biological indicator of climate change in agroecosystem in Korea. Given the important risk and impact on beekeeping, socio-biological as well as ecosystem and biodiversity levels, careful monitoring of phenology, range expansion and preventive efforts mitigating the impact are further required.