Purpose: Copper is a cooling transfer material used in cryogenic superconductingsystems. The effective thermal conductivity (ETC) of copper in the 4K region is onlyabout 400 W/(m K). Its heat transfer performance is poor, there are some shortcomingssuch as large temperature difference, temperature fluctuation lag, cryogenic systemlayout limited. The ETC value of helium-based cryogenic oscillating heat pipes (COHP)in the 4K region is much higher than that of copper. However, the choice of heatingpower interval is very important, and the heating power will affect the oscillationcharacteristics of COHP.Methods: In this study, a helium-based COHP heat transfer performance test platform wasbuilt in the 4K region, and the effects of heating power and liquid filling rate onoscillation conditions and ETC were studied. The heating power ranges from 0.1 to0.5 W, and the liquid filling rate ranges from 20% to 87%.Results and conclusion: The heating power interval suitable for oscillation behavior is givenquantitatively. The intrinsic correlation between ETC and amplitude is furtherdiscussed. The results are of great significance for improving the performance ofcryogenic superconducting systems.