摘要：In this talk, we will discuss how to compute the local mass of SU(n+1) Toda system. By using Pohozaev identity and the monodromy theory from complex ODE, we are able to determine the local mass for the system and it turns out that the local mass is closely related to the element in the Weyl group of the corresponding Lie algebra. Based on this quantization result, the a priori estimate and some existence result of this system are obtained.