The Composition profile of the Dichloromethane extract of the leaves and Flowers of Ephedra alata growing in Algerian desert was studied by capillary gas chromatography-mass spectrometry (GC-MS). Fifty-two Compounds of the leaves and Sixty-five Compounds of the flowers were identified. The main Compounds of the leaves are: 2-Propenoic acid, 3-phenyl (18.194%); Phenol, 4-(3-hydroxy-1- propenyl) (7.881%), Benzoic acid (8.521%), Benzaldehyde, 4-hydroxy-3,5-dimethyl (7.036%); Benzaldehyde, 4-hydroxy- 3-methoxy (4.381%). On the other hand the flowers contain some important compounds such as Benzoic acid (16.874%), 2- Propenoic acid , 3- phenyl (11.453%), 1,2-Benzenedicarboxylic acid, diis (5.112%), Benzenemethanol (3.675%), Benzeneethanol (3.645%).
