Two new series of mesogenic bis-heterocyclic derivatives containing pyrazoles and isoxazoles 1a-b were reported. One single crystallographic structure of mesogenic 2a (n=8) was determined by X-ray analysis, and it crystallizes in a triclinic space group P-1, with a=7.0511(2), b=7.6303(2) and c=21.2143(5) Å, and Z=2. The crystal was considered as slightly bent-shaped molecule with a molecular length of ca. ∼24.9 Å. A dimeric correlated structure induced by H-bonds was observed in the crystal lattice, which was favorable to the formation of mesophases. All compounds 1-2 exhibited N, SmA, N/SmC or SmA/SmC phases, as expected for linear-shaped molecules. All compounds 1 have higher clearing temperatures and wider ranges of mesophases than those of their precursors 2, which might be attributed to have higher dipoles polarized by two heterocyclic rings in 2.