Aiming at the problem of grain surface increasing of certain type warhead charge, carry out test on warhead charge thermal expansion feature. Consider the product category and quality situation, make the investigation scheme, and analyze the typical product of charging. According to the product lab experience data, explosive sample data and so on. Carry out high temperature sustainable test investigation, data measurement, data statics and test verification of every stage of product research. The results show that the inherent characteristic of warhead charging thermal expansion is acquired and put forward related application suggestion.