This study introduces the construction of the satellite observation cycling assimilation system in national satellite
meteorological center (NSMC). A typhoon case (1209 Saola ) is chosen to be performed as a testing experiment to check
the operation of the cycling assimilation, with a low resolution . Three experiments are designed: control, ATOVS
microwave observation assimilation and forecasting with cold starting, assimilation and forecasting with warm starting.
Compared with the cold start forecasting, cycling forecasting showed advance in describing more information of the
Tropical Cyclones in detail. As for track and intensity prediction, both the two assimilation experiments were prior to
control experiment. Especially, the cycling experiment is better than cold experiment in the first one day and third day
and the day before landing, but not act well in its peak period, which may suggest that the model couldn’t not match the
description of the typhoon Saola at the full developing period or upgrading develop period, with the low resolution in the
testing experiments, but also can demonstrate well when it develop slowly or in a relatively steady period.