Two different Volume Coverage patterns are used for monitoring convective weather in CINRAD SA.Because of the difference in two VCPs, the products derived from base radar data through using meteorological algorithmsare different,too. In order to explain it,a new Volume Coverage pattern (VCP22) is established and the products from VCP11 and VCP22 are compared. It shows that the products had the same values in shallow convection and different values in deep convection within the range of 150km. Therefore,it is confirmed that VCP11-not VCP21-should be used when the deep convection is occurred within the range of 150km.