Abstract: The fluid-rock interaction in some jadeite jade, as well as the enhancement of colour and structure could be observed in the secondary reducing process.Based on the geological phenomena, the possibility that some new authigenic minerals are formed by the jadeite in fluid-rock interaction is discussed according to the thermodynamic calculation.The results show that the jadeite jade is most likely to have a reaction with Mg²⁺ and Fe²⁺ so as to form chlorite in the presence of additional Mg²⁺ and Fe²⁺ and the secondary reducing process, which offer the theoretical explanation for the colour changes of the colourless jadeite jade in the secondary reducing process.