A broadband tunable metamaterial absorber based on vanadium dioxide (VO

2

) rings with different radius loaded on the dielectric layer is designed. The phase transition characteristics of VO

2

with temperature are used to realize the dynamic adjustment of the absorption curve of external temperature. Simulation calculations show that the absorber can reach more than 90% in the bandwidth of 8.09~11.23THz when the external temperature is 350K

showing high absorption characteristics; while the absorption coefficient in the same frequency band is always lower than 20% when the external temperature is 300K

achieving the adjustabl

e function of electromagnetic wave absorption. The equivalent impedance and electric field distribution of the absorber are further analyzed and discussed

and the adjustment mechanism of VO

2

on the absorption is clarified. In addition

the article discusses the effects of structural parameters

polarization angles

and angles of incidence on the absorptivity. The results show that reasonable selection of parameters of the structure can achieve the independence of the absorbing performance from the polarization angle and the angle of incidence. The conclusions of this paper have promising potential for designing other types of ultra-wideband tunable absorbers.