Study on ³He release character of ZrT_x

³He release from 2 ZrT_x samples was measured incessantly within 6 years. Measurement results show that the early ³He release fraction (RF) of 2 samples was at 10^-6 -10^-5 level, which can raise slowly to be at 10^-4 level with the ³He concentration raising to 0.31, and then the increase rate of the RF value is higher than that of before. When the ³He concentration in the samples are more than 0.38, the increase of the ³He release can get so rapidly that the RF value raises to 10^-1 level in a short time. This period is defined as the accelerated release phase of the samples. ^3He release from 2 samples in 5.6 seconds were scanned in the period after the samples' accelerated release phase. Scan spectra show that there are 2 modes for the ³He release from the ZrT_x sample, one is the diffusion mode in which the ³He release with a equal speed which is about 50% of the produced speed, and the other is the burst mode in which about 10¹² - 10^{14 3}He atoms erupt from the sample in a burst way. (authors)