Serpentine jade in Kuancheng county, Hebei Province is mainly founded at the junction of the eastern edge of Kuancheng Manchu Autonomous County, Chengde City, Hebei Province and Lingyuan City, Liaoning Province. This kind of jade is exquisite in structure, and the color can be flesh red or green, which is called "Rehe jade" in the local market. In this paper, serpentine jade samples with flesh red and green color from Kuancheng county were systematically investigated using the conventional gemological methods combined with Laser Raman Spectroscopy, electron probe microanalyzer (EPMA), X-ray powder diffraction (XRD), laser ablation-inductively coupled plasm-mass spectrometry (LA-ICP-MS) and Visible absorption spectrometer, in addition, its radiation safety was tested by gamma spectrometer. The results show that the refractive index and relative density of the flesh red samples are both low, with 1.54-1.55 and 2.33-2.43, while the green samples are 1.55-1.56 and 2.58-2.62; The flesh red samples contain essential mineral of clinochrysotile and auxiliary minerals of calcite and diopside, with fiber interwoven texture, fiber column-grain interwoven texture, and metamorphic residual biological skeleton texture can be seen locally; The green samples contain essential mineral of antigorite and auxiliary minerals of talc and mackinawite, with more delicate fiber interwoven texture; Elemental analysis shows that the content of Fe and Mn in flesh red samples is high, ranging from 184.9 to 951.7×10-6 and 106.4 to 287.3×10-6, respectively, while the content of Fe in green samples is very high, reaching 5,979 to 6,359×10-6. Combined with visible light absorption spectrum test, it is considered that the flesh red color caused by Fe3+, Fe2+ and Mn3+, and the green color caused by Fe2+ and Fe3+ ; The radioactivity test results indicate that the internal and external radiation indexes, and specific activity of Kuancheng serpentine jade is lower than the standard requirements, which is harmless to human body.