Serpentine jade from Yingkou is a special kind of traditional Xiuyan jade. Its physicochemical characteristics and metallogenic type are considerably different from those of Xiuyan jade. In this paper, the negative ion emission function and mechanism of Yingkou serpentine jade were investigated using the modern analytical techniques such as ETS-2 Energy Measurement system, polarizing microscope and ICP-MS. It is found that the serpentine jade from Yingkou has a good function of releasing negative ions whose concentration is similar to that in the city park and higher than that of tourmaline, which is regarded as an excellent environment material. The negative ions are generated because of the ionization of surrounding air and water which is caused by the radioactive elements in the serpentine jade. The serpentine with biological and chemical activity and the radioactive trace elements in the Yingkou jades work on the air and water and consequently generate high quantity of negative ions.