Abstract: By using the NCEP/NCAR reanalyzed date and monthly dynamical extended range forecast products of T63 model, the analysis of the correlation coefficients, anomaly, the accuracy of anomaly sign, the anomaly correlation coefficients about geopotential height at 200 hPa, 500 hPa fields, and U, V wind at 200 hPa, 700 hPa fields could be acquired.The results are as follows:monthly dynamical extended range forecast products of T63 model are good at simulating the Polar Vortex, the South Asia high and the Subtropical high.The simulated subtropical systems in summer and the westerlies systems in winter are stronger than the reality systems, while the simulated westerlies systems in summer and subtropical systems in winter are weaker than reality systems.The anomalous errors of westerlies and subtropical systems basically present the forecasted errors and the movement of the dominant systems about annual climate change.