This study used phospholipids from fresh egg yolks to prepare liposome-encapsulated semi-permanent hair dyes in different pH buffer solutions and evaluated the functions and colour fastness to washing of the dyes. The extraction ratio of egg yolk phospholipids was 5%%, and the purity was 91.8%%. Empty liposome solutions were then prepared using high-speed homogenizer with particle size 219--848 nm. After being stored at 4 degrees A degrees C for 28 days, the average particle size of the liposome-encapsulated dye formulas increased from 1.36--1.92 mu A mu m to 1.99--2.38 mu A mu m. The delta Delta E colour difference values of the five hair extension sets dyed with the control group and hair dyes on the market were of the range 6.56--13.39 after eight times of washing, whereas the delta Delta E values of the four hair extension sets dyed with the liposome-encapsulated dyes were of the range 3.56--5.21 after eight times of washing. The liposome-encapsulated dye at pH 3 showed the best result.