Abstract: Minimum quench energy (MQE) and minimum propagation current (Imin) are the two parameters crucial to not only the stability hut the self-protect ion of superconductor, A numerical simulation was done using FEM for the thermal stability of high-temperature Bi2223/Ag superconducting tape and the results were compared with experimental results. It was found that the temperature transition process from superconducting state to normal state can be conveniently simulated on computer through developing a suitable thermal analysis model, thus estimating MQE and Imin. The results from numerical simulation are basically in line with that from experiment, and such a fact is of theoretical significance to the practical application of high-temperature superconductors.