Abstract: The main difference between earthquake tremor and microtremor is amplitude, however, both have same election results of frequency for same ground. It means that there is an significant amplication effect for a certain frequency range, soits good for pulsation earthquake and disaster mitigation to understand the characteristics of microtremor. To understand it in loess regions and reveal slope dynamic response characteristics, according to the microtremor observation data of 68measuring points in the west ofloess regions of Tianshui, the predominant period is analyzed using the method of spectral ratio; Based on the geological records of 7 boreholes and shear wave velocity distribution, Accordance with theOne-dimensional dynamic soil response theory tocalculate the soilnatural period, the results are more consistent both methods. In addition, the use of statistical methods to obtain the mathematical relationship between theslopemicrotremor predominant period and slope overburden thickness and height. Provide a reference to analyze the dynamic characteristics of major landslides andnatural slopes in loess regions of Tianshui.