Field geological observation, microscopic observation, electron microprobe analysis and X-ray diffraction patterns of the Hua'an Jade indicate that the green stripes of Hua'an Jade are formed by diopside, the red stripes are formed by K-feldspar, and the white stripes are formed by quartz and calcite. Based on a study of tectonic setting, original rocks and genesis of Hua'an Jade, the authors have found that Hua'an Jade was formed in surrounding areas of the lagoon-tidal flat on the edge of the passive continent, and the original rocks are mainly made up of calcareous sandstone, mudstone and siliceous rocks. The Hua'an Jade hornfels was formed by multi-phase thermal contact metamorphism and metasomatism of Yanshanian magmatic activity.