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The study of quasi-periodic oscillations (QPOs) and power density spectra(PDS) continuum properties can help shed light on the still illusive emissionphysics of magnetars and as a window into the interiors of neutron stars usingasteroseismology. In this work, we employ a Bayesian method to search for theQPOs in the hundreds of X-ray bursts from SGR J1935+2154 observed by {\itInsight}-HXMT, GECAM and Fermi/GBM from July 2014 to January 2022. Although nodefinitive QPO signal (significance $>3\sigma$) is detected in individualbursts or the averaged periodogram of the bursts grouped by duration, weidentify several bursts exhibiting possible QPO at $\sim$ 40 Hz, which isconsistent with that reported in the X-ray burst associated with FRB 200428. Weinvestigate the PDS continuum properties and find that the distribution of thePDS slope in the simple power-law model peaks $\sim$ 2.5, which is consistentwith other magnetars but higher than 5/3 commonly seen in gamma-ray bursts.Besides, the distribution of the break frequency in the broken power-law modelpeaks at $\sim$ 60 Hz. Finally, we report that the power-law index of PDS hasan anti-correlation and power-law dependence on the burst duration as well asthe minimum variation timescale.

Individual and Averaged Power Density Spectra of X-ray bursts from SGR J1935+2154: Quasiperiodic Oscillation Search and Slopes