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We have carried out 12CO J=2-1 and 12CO J=3-2 observations toward thehigh-mass protostellar candidate IRAS 20188+3928. Compared with previousobservations, the 12CO J=2-1 and 12CO J=3-2 lines both have asymmetric profileswith an absorption dip. The velocity of the absorption dip is 1.0 km/s. Thespectral shape may be caused by rotation. The velocity-integrated intensity mapand position-velocity diagram of the 12CO J=2-1 line present an obvious bipolarcomponent, further verifying that this region has an outflow motion. Thisregion is also associated with an HII region, an IRAS source, and an H2O maser.The H2O maser has the velocity of 1.1 km/s. Compared with the components of theoutflow, we find that the H2O maser is not associated with the outflow. Usingthe large velocity gradient model, we concluded that possible averaged gasdensities of the blueshifted lobe and redshifted lobe are 1.0*10^{5}$ cm^{-3}and 2.0*10$^{4} cm^{-3}, while kinetic temperatures are 26.9 K and 52.9 K,respectively. Additionally, the outflow has {a} higher integrated intensityratio (I_{CO J=3-2}/I_{CO J=2-1}).

CO J=2-1 and CO J=3-2 observations toward the high-mass protostellar candidate IRAS 20188+3928