The EI mass spectra of sixty-six new fluorinated liquid crystal compounds, including three types, were studied. The fragmentation mechanism has been discussed. The results may be summarized as follows: for type A , the C---O bond cleavage of centric bridge occurred predominatly leading to formation of the ion which was very easy to lose C~nH~2~n; for type B, the α-cleavage of the centric bridge carbonyl gave the characteristic ion and for type C, they all showed strong molecular ion peaks, the fragmentation pathways of the latter were very simple.

Key words: FLUORINE COMPOUNDS, LIQUID CRYSTALLINE POLYMER, MASS SPECTROGRAPHY