The internal relations between the failure mechanism of TV-tube’s cathode and acceleration model （Arrhenius equation） are explored by means of "simulated acceleration" and "spot analysis" in the AES chamber. The results show that the exponential factor E of acceleration equation represents the "apparent activation energy" of Ba; the accelerated life is largely confined by evaporation of Ba on the surface of cathode; the accelerated life test with greater acceleration ratio is feasible.