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Corn straw can be converted into monophenyl compounds by hydrothermal liquefaction (HTL) in Nano ferrite+inorganic base catalyst system, and dual catalytic systems were favorable for some specific monophenyl compounds in this process. [Display omitted] • HTL of corn straw with Nano ferrite + inorganic base catalyst system was reported. • Highest yield of heavy bio-oil was 34.02 wt% at 180 °C with ZnFe 2 O 4. • Dual catalytic systems were helpful to preparation of mono benzene ring compounds. • Dual catalytic systems have obvious synergistic effect. Hydrothermal liquefaction of corn straw with different catalytic systems and temperatures were investigated in this study. Results showed dual catalytic system can effectively promote the degradation of corn straw at low temperature. With increase of temperature, aqueous phase increased and straw residue decreased for all catalytic systems. The heavy bio-oil yield increased with the increasing of temperature for single catalytic system, while the trend was opposite for dual catalytic system. In single catalytic system, ZnFe 2 O 4 was more suitable for preparation of heavy bio-oil, and the maximum yield reached 34.02 wt% at 180 °C. The proportion of monophenyl compounds in heavy bio-oil for dual catalytic system reached the maximum of 84% at 220 °C with ZnFe 2 O 4. At 180 °C, the contents of Benzofuran,2,3-dihydro and 2-Methoxy-4-vinylphenol reached the maximum of 31.42% and 17.64% in CoFe 2 O 4 catalyst system, and the maximum yield of Vanillin was 10.82% with ZnFe 2 O 4. [ABSTRACT FROM AUTHOR]