Abstract: In South China Sea, centers of tropical depressions often slant along the perpendicular direction. The center of lower circulation is obviously inconsistent with that of upper circulation. As for a forecaster, too much concern about the cloud cluster itself on a satellite image will often cause an incorrect judgement and lead to a failure of forecast. Its necessary for forecasters to pay more attentions to the changes of the lower circulation, especially when the cloud cluster or the wind speed appear to be extremely asymmetrical, which may cause the low pressure circulation to change its direction or an obviously dynamic inconsistency when approaching the coast. These are some features of the complexity of the South China Sea TC. To make out a satisfying forecast, comprehensive and careful analysis on varieties of information is needed. This article is to share some experience in dealing with this type of tropical depression in the South China Sea, hoping that it can offer some reference.