The root exudates of Hippophae rhamnoides naturally growing in hilly region of Loess Plateau were detected by gas chromatographymass spectrum. Root exudates released from Hippophae rhamnoides of different growth states are similar and mainly of acids. The percentage of organic acids, phenolic acids and fatty acids in better-grown Hippophae rhamnoides are, respectively 21.2 48.15 and 17, while in poor-grown Hippophae rhamnoides are 7.2, 30.52 and 33.79 and in the dead one are 58.74, 23.59 and

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... 6. Teradecanoic acid and hexadecanedioic acid have adverse effect on the growth of Hippophae rhamnoides. Acetic acid and butenedioic acid are related to Hippophae rhamnoides's death. Diphenylamine in rhizosphere soil is an external factor affecting Hippophae rhamnoides's growth.