A large degree of supercooling is necessary to form the tetra-n-butylammonium bromide (TBAB) semiclathrate hydrate. Developing an effective method to suppress supercooling is essential to use semiclathrate hydrates as potential thermal storage media. One of the methods is the memory effect, which is a kind of temperature hysteresis. We have already reported the relationship between the memory effect and the solution structures in the TBAB semiclathrate hydrate reformation, based on the scanning electron microscopic observation. In this presentation, we indicate some phenomena that would be derived from the existence of the solution structure. We would like to discuss the thermal stability of the solution structures.