The physical, hydraulic and mechanical properties of site soil, as well as the environmental differences found there, have impacts on the conservation of earthen construction sites as a whole. The stability of remixed soil properties of remolded samples is the basis and prerequisite for scientific evaluation and comparative analysis of experimental studies, since using remolded samples instead of earthen sites are an important means for testing various properties. In this study, based on different methods of soil mixing, we comprehensively evaluated the influencing conditions of different soil mixing methods by observing, photographing, measuring the sizes of soil aggregates and testing the unconfined compressive strengths of samples prepared under the same conditions. According to the results, the most stable soil samples were those which had been smothered for 24 hours, and the strengths of the soil samples gradually decreased with the increase of the smothering time again. This study provides theoretical and technological support for the indoor experimental research on soil mixing of earthen construction sites.