Abstract: Tuned mass damper (TMD) is a typical and effective passive control device for structural dynamic response. Liquid mass is often used as the tuning mass of TMD in engineering. Liquid mass has a significant influence on the frequency and mass ratio of TMD, and there is no quantitative research conclusion on this. To address the impact of the influence of liquid sloshing effect on TMD, the influence of liquid sloshing on the dynamic characteristics of TMD was discussed through the comparison of shaking table test between traditional solid mass TMD and liquid mass TMD. Additionally, the accuracy of Housner model for liquid mass TMD design was discussed through the comparison of theory and experiment. Results show that liquid sloshing can increase the frequency of TMD by 15%-30% and reduce its participating mass by approximately 30%. Housner model can accurately describe the modal characteristics of liquid TMD, however, it has a significant error in describing the dynamic time-history response.