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In order to study the performance of the molten salt electrolytic of the Zr/CuO pyrotechnic battery, in this paper, automatic slag melting point melting speed locator is used to observe the contractibility rate of the sample.By defining the contraction rate of the sample as 25% to 50% of the temperature is to be the melting temperature range.Two systems are tested during the experiment.One is the LiF-ZrO2 system and its melting temperature region is 831 ℃to 1276 ℃.Another one is LiF-ZrO2-asbesto system and its melting temperature region is 814 ℃~1098 ℃.Comparing with the two systems, find that adding the asbestos can reduce the melting temperature region of the molten salt electrolytic.