Abstract: The absorption spectra of chlorophyll d in different solvents [1,4-dioxane, petroleum ether (b. p. 30–60 ℃), petroleum ether (b. p. 60–90 ℃), ethyl ether, acetone, 80% acetone, benzene, chloroform, carbon tetrachloride, pyridine, carbon sulfide, methylene iodide, methanol, ethanol, 80% ethanol, n-propyl alcohol, iso-propyl alcohol, n-hexyl alcohol, ethanol: acetone (1:1) and ethanol: acetone (2:1)] were studied. The effects of refractive index and dipole moment of organic solvents and water on the red absorption peak of chlorophyll d were discussed.