We studied Asian scale source-receptor (S-R) relationship based on the tagged CO tracer model. GEOS Chem (Version 9-1-1) was used with a high-resolution Asian domain (0.5˚ x .667˚ resolution) 1-way nested to the global domain. A ten-tagged region was set in the Asian region. The model results showed a good agreement with the surface CO measurements (Yonaguni (YON), Ryori (RYO) and Minami-Torishima (MNM)) and the MOPITT satellite CO measurement. Intermittent CO peaks were well simulated during the winter to spring seasons both at YON and RYO, and its daily averaged concentration ranged from 200 - 300 ppbv. Numerical model also showed low summertime CO concentration below 100 ppbv. The annual averaged CO concentration over the Central-East China (CEC) region reached 500 ppbv. A S-R analysis showed that more than 80 % of the CO was coming from Chinese domestic emissions in that region. The fraction of CO due to the Chinese emission was 50% over the Korea and 35 - 40 % over the Japan region. An analysis of the seasonal variation indicated that the CO originated from China mainly dominated in the winter-spring seasons, while the non-Asian source and natural VOC origin CO showed a relatively high fraction in the summer season.