The spatial distribution and dynamic change of main trace elements in soil were studied in the loess hilly region of Qinghai Province. The result showed that the effective trace elements Fe, Cu, Zn, B had higher variability, Mn had higher or moderate variability. In view of soil series, the effective state of trace elements in the Dark Cinnamon and the Chernozem reached the rich level(high level), while that in the irrigated soil was far below the threshold. From the view of the soil stratification, the coefficient of variation changed little. In the shrubbery forest lands, soil trace elements were lacking relatively expect available B which just reached to the rich level. However all the trace elements reached the high levels in the mix forest lands.