Objective: To analyze the liposoluble components of Pinellia pedatisecta. Method: The liposoluble components of P. pedatisecta were extracted by ethanol; the extract was abstracted by chloroform

which can get liposoluble components and analyzed by gas chromatography-mass spectrometry(GC-MS). Result: Nineteen liposoluble components were identified as trichloroacetic acid 1.86%

cis-1

2-cyclohexanediol 3.56%

heptylhydroperoxide 1.66%

(Z)-2-undecene 5.54%

1-hexene

1-butoxy-2-ethyl-4.13%

pyrrolo pyrazine-1

4-dione

hexahydro-3-(2-methylpropyl)-6.36%

n-hexadecanoic acid 23.32%

10-undecynoic acid 33.81%

cyclopentane undecanoic acid 1.11%

2

5-piperazinedione

3-benzyl-6-isopropyl-2.95%

2-bromononane 1.04%

pyrrolo pyrazine-1

4-dione

hexahydro-3-(phenylmethy)-5.73%

4-ethyltetrahydro-2H-thiopyran 1.77%

docosane

1

22-dibromo- 1.26%

cyclopropane

1

1-dichloro-2

2

3

3-tetramethyl- 2.31%

6

9

12-octadecatrienoic acid

phenylmethyl ester

(Z

Z

Z)1.00%. Conclusion: The liposoluble components of P. pedatisecta have been further determined to establish the basis for antitumous effect.