In previous papers wa reported that the lithium complex of o-nnethoxyphenol showed quite different characteristics in their IR spectra as compared with the spectra of other organic lithium complexes,and assumed that the change of their spectra with temperature implied the change of structure at different temperatures.In this paper we measured the IR spectra of the isotopic lithium complex of o-methoxyphenolate in a rather wide temperature range(-130°~100℃) and found that some characteristic IR spectra bands (970,790,500,460,410cm^-1) of the lithium o-methoxyphenolate were enhanced with lowering temperature,the two bands (970,790 cm^-1) are assumed to belong to the stretching frequency' of the network structural form of superozide.