This paper analyzed the build-up characteristics of Er3+ 4S3/2 and the relationships between Er3+ 4S3/2，4I11/2 and Yb3+ 2F5/2 according to the energy structure for green up-conversion emission and relative transition rating function model for Er3+-Yb3+ codoped tellurite glass. Through fitting the build-up and decay curves by the model the relative parameters for rating equation model were determined，and the relative value between energy transfer and excited state absorption when population of 4S3/2 energy tend to be stable was calculated，also the dynamic processes in green up-conversion emission of Er3+-Yb3+ codoped tellurite glass were analyzed.