Abstract: The essential oil composition of four hybrid germplasms of white pepper(Piper nigrum L.) were analysis by GC-MS method. The results showed that different hybrid germplasms had great influence on the constituents and their contents of the white pepper essential oil. The main constituents of four kinds of white pepper essential oil were 3-carene, limonene, caryophyllene, α- caryophyllene, β-pinene,β-Myrcene , δ-elemene and α -pinene. (+)-Cyclosativene , calarene andβ-terpinene were detected only in white pepper essential oil of hybrid No.8;α-terpinene, β –thujene and α-selinene were detected only in white pepper essential oil of hybrid No. 2,6 and 7.