The dragon shaped horsehead bronze Jian unearthed from Zhangzhuang Qiao Tomb Group King Zhao M1, which was a national first-class bronze cultural relic cast in the early Warring States period and buried in the Eastern Han Dynasty. Based on the methods such as polarizing microscope, Raman spectroscopy, X-ray diffraction, scanning electron microscopy energy spectrum, etc., the green, blue, and gray white corrosion on its surface were respectively determined to be malachite, azurite, and quartz. After cleaned, derusted, repaired, and sealed treatment, the state of bronze jian had reached stability. As a practical tool was soughted after by the nobles of Zhao in the Handan region, the horsehead bronze jian had important archaeological and historical research value. The use of horsehead as ear decoration pattern was a concentrated reflection and microscopic portrayal of the important role played by the horse in the development, inheritance, and evolution of Zhao culture.