Tellurate luminescent glass doped Er3+ is prepared with TeO2, ZnO, La2O3 as matrices. Judd-Ofelt(J-O) theory is applied to calculate the three spectral intensity parameters, and the transition radiation lifetime, fluorescence branching ratio and integral emission cross section in each energy level of erbium ion atom configuration. It is found that the integral emission cross section is larger (greater than 10-18 cm), which shows good laser emission characteristics. Based on the abundance of 4f energy levels in rare earth ions, the possibility of energy levels cross relaxation between Er3+ ions is analyzed. Its application foreground in up-conversion and quantum cutting is also pointed out. It provides experimental basis and theoretical reference for further application on the single or multiply doped rare earth ions in tellurate glass.