Abstract: Hue, saturation and brightness is the basic parameters of jade colour grading. Based on the colour parameters extracted by colour digital camera, a computer analysis program is developed and the collected green jadeite jade images were classified. As a result, type, uniformity of colour can be received. Finally, the authors used the subjective classification and the GemDialogue card to verify this program's effectiveness, and proved that this method can realize a fast, objective and repeatable colour analysis of green jadeite jade.