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A study is made of the temperature‐induced phase transition in the magnetic bubble lattice (MBL) at which the MBL is decomposed into two coexistent phases, namely, blocks of a new lattice and stripe‐domain areas. A thermodynnmic analysis of the process of formation of the stripe‐domain nucleation centres is performed and the critical size of the nucleation centre is found. It is shown that if the film material characteristic length decreases with increasing tempernture the critical size of nucleation centre decreases and that at a certain temperature the MBL becomes unstable against the formation of two‐phase structure. The dependence of the MBL thermal stability range on the bias field strength is obtained and the relative number of bubbles decomposed into stripes is found. A comparison with the experimcnt is made.

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