In order to meet the needs of the silkworm-growing programme in our country,we have synthesized two insect hormone mimics possessing high juvenile hormone activity to be used for improving silk yield.These compounds(Ⅵ,Ⅶ) were prepared from geraniol(Ⅷ) or linalool(Ⅸ).Treatment of Ⅷ or Ⅸ with phosphorus trihalide gave geranyl halide(Ⅹ).Alkaline catalysed condensation of X with p-ethyl phenol afforded the P-ethyl phenyl terpenoid ether(ⅩⅠ),whioh on alkoxymercuration in the appropriate alcohol followed by borohydride demercuration furnished the final product(Ⅵ) or(Ⅶ) respectively with the diethogy compound(Ⅷ) as a by-product.The biological activity of Ⅵ is superior in comparision with that of Ⅶ.The physical and chemical constants of the final products and related intermediates were recorded.