Dyed agate has been considered to be the optimal treatment for agate, and is acceptable by the customers. However, lots of media hold that dyed agate contains hazardous elements which are potentially harmful to people's health. In order to determine whether the agate from Dongpu of Xiamen and Boluo of Huizhou is harmful to people's health or not, the authors analyzed the hazardous elements and the dissolution hazardous elements in the agate bought from these two production and wholesale markets, and after the authors dyed the agate in the laboratory the hazardous elements were analyzed again. All the results show that the hazardous elements are under the limits, and hence should cause no harm to people's health.