Abstract: On the basis of the document(6), the mass budget and absolute angular momentum budget in four concentric areas of the typhoon 7908 are calculated with the application of the FGGE3B data. It follows that the process which the typhoon evolves may be characterized by the angular momentum about its axis during the most prosperous development of the typhoon the angular momentum in middle troposphere reachs maximum and that absolute angular momentum of the typhoon mainly comes from the lateral transportation. As concerning lateral transportation, the results also show that the eddy transport (due to asymmetic circulation)is important before the typhoon genesis; the average and the eddy transport both have the equivalent impor - tance in the early stage of the typhoon; the average transport is more important during the most prosperous development and the decay of the typhoon By a compa rison between the forcing functions, it is found that the condensation heating is more important factor affecting the vertical transportation of angular momentum. On the basis of the angular momentum balance ,it is found that the effect of subgrid scale is marked, which shows that the action of the cummlus convection may be another important manner to the redistribution mechanism of momentum in the system besides vertical transportation.