A new method of fetching unbroken tea color with computer,named L Method,has been established. The accuracy of the method was verified,and the further investigation also has been fulfilled. The results showed that the L method can fetch the color of tea accurately and quickly. Scanned with resolution 100βdpi,the credible interval(95%) of the result is: L=0,-0.45≤a≤0.45,-0.71≤b≤0.71. When the scanned area is 11βcm×11βcm or more,the color parameters of tea scanning photo may fully stand for the tea actual color. The SE is: -0.16≤L≤0.16,-0.13≤a≤0.13,b=0. There was obvious distinction between the color of unbroken tea and crush tea, so the later can't represent the tea actual color. Using computer to fetch color parameters is better than chroma meter.