Abstract: Coronal mass ejections (CME) are solar transients, and their impacts on the planets within the solar system have attracted considerable attention. As neighboring planets within the solar system, Venus and Mars are also directly and indirectly affected by CME. Existing researches indicate that the responses of the magnetosphere, ionosphere, and planetary ion escape of Venus and Mars to CME are dramatic. Additionally, the neutral atmosphere undergoes significant changes during solar flares associated with CME eruptions and is affected by energetic particles accompanying CME, such as the neutral heating and aurora emissions at Mars. Moreover, the change of magnetic field topology and the increase of plasma precipitation are observed at Mars, and the thin atmosphere and localized crustal magnetic fields of Mars result in unique manifestations of the CME effects on its surface environment, such as the enhancement of the radiation dose rate on the surface of Mars and the occurrence of Forbush decreases. In addition to the increase of ion escape, the escape rates of neutral species also increase greatly under the flares. This review summarizes the recent research findings regarding the effects of CME on Venus and Mars, aiming to gain a deeper understanding of the significance of these impacts on the space environments of Venus and Mars, as well as on future exploration missions.