2C-B and Phentermine of psychic drugs were determinated by gas chromatography mass spectrometry (GC/MS). Mass ion fragment of the 2C-B was m/z230 and m/z232, m/z77, m/z91, m/z199, m/z201, m/z215, m/z217, m/z259 and m/z261;Mass ion fragment of acetic acid anhydride derivatives of the 2C-B was m/z242 and m/z244, m/z77,m/z148, m/z199 and m/z201, m/z229, m/z301 and m/z303. Mass ion fragment of the phentermine was m/z58, m/z91, m/z134;Mass ion fragment of acetic acid anhydrid ederivatives of the phentermine was m/z58, m/z91, m/z100, m/z117 and m/z134.
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