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The transient burst of an inteal kink mode is first observed in EAST heavy impurity ohmic plasma.The features of the electron fishbone-like mode are presented,and the fishbone-like instabilities are found to be driven by the trapped supra-thermal electrons.The processional frequency of the trapped supra-thermal electrons is calculated with different discharge parameters.The results indicate that the calculated processional frequency is consistent with the experimental observations,Furthermore,we also find that the frequency chirping of the long-lived mode is related to the evolution of the safety factor profile.