A series of high-frequency (4th-6th or 7th order) cycles are sacked within Mid-Cambrian oolitic carbonate depositional successions in the North China Platform. Two ranks of cycle average thickness, stacked pattern and ratios of various cycle orders and wide correlation across the platform suggest that they could be related to the Milankovitch orbital cycles. The implication of the regularly periodities of orbital cycles is used to date the duration of strata internals,event layers and biozones et al.. The internal duration of the Mid-Cambrian stages, 3rd -6th order cyclic sequence (cycles) or boundary are estimated by the cyclost ratigraphy approach in the study.