This study is carried out on the structural improvement of military mobile kitchen trailer for the betterment of fighting power by serving meals to solider in right time. To recognize the real problems of field kitchen trailer, the heat transfers from burner for soup cooker were compared with each other. By the test, the necessity of improvement was deduced. To examine the cause of cooking time, it was determined by the characteristic diagram. Based on the cause, there are two types of kitchen trailer's burner structures. To verify the improved structures, it was carried out for the performance test. As the results, the time did not become longer and the temperature rising rate per minute increased. This study is expected to be devoted to the future improvement of military mobile kitchen trailer.