Abstract: In room temperature the fuel gas storage halflife of the thin-wall (wall-thicknees less than 1m m) glass microsphere is only a few days, it is difficult to be used for ICF. To efficiently prolong the half-life of such type targets, and meet the need of ICF experiments, the special device for storing the targets was developed. All the targets are immerged in liquid-nitrogen (LN2), after being sealed in vacuum. During this period the change of Si 1.74keV X-ray counts were measured a few times with the low energy X-ray multi-channel analyzer. The results of experiment indicate that, in the environment of - 96℃, the fuel storage half-life of target has been successfully extended to 100~300d from 3~10d. However, the surface roughness of target was not obviously changed.