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In this paper, experiments and simulations were conducted to investigate the cyclic variations of gasoline/diesel and ethanol/diesel dual-fuel combustion. For both dual-fuel modes, gasoline and ethanol were injected into the intake port during the intake stroke and diesel was directly injected into the cylinder. The influences of engine load and port fuel proportion on the cyclic variability of both dual-fuel modes were investigated. At each test condition, in-cylinder pressure traces of 150 consecutive cycles were acquired. Then the cyclic variations of ignition timing (CA5), combustion phasing (CA50), accumulated heat release (Qf) and indicated mean effective pressure (IMEP) were calculated based on the in-cylinder pressure. The experimental results showed that the cyclic variation of IMEP was mainly caused by the variation of Qf for both dual-fuel modes.