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Many supernova remnants (SNRs) are considered to evolve in molecularenvironments, but the associations between SNRs and molecular clouds (MCs) areoften unclear. Being aware of such ambiguous case, we report our study on themolecular environment towards the SNR G43.9+1.6 by CO line observations. Weinvestigated the correlations between the SNR and MCs at different velocities,and found two velocity components, i.e. $\sim$5 km s$^{-1}$ and $\sim$50 kms$^{-1}$ velocity components, showing spatial correlations with the remnant.However, no dynamical evidence of disturbance was found for the $\sim$5 kms$^{-1}$ velocity component. At the distance of the $\sim$5 km s$^{-1}$velocity component, either near or far distance, the derived physicalparameters are unreasonable too. We conclude that the SNR is not associatedwith the $\sim$5 km s$^{-1}$ velocity component, and their spatial correlationis just a chance correlation. For the $\sim$50 km s$^{-1}$ velocity component,dynamical evidence of disturbances, as well as the spatial correlation,indicate that it is associated with the SNR. We found that all the CO spectraextracted from the molecular clumps distributed along the border of the remnantare with broadened components presented, which can be fitted by Gaussianfunctions. By further analysis, we suggest that the SNR is at a near kinematicdistance of about 3.1 kpc.

Molecular Clouds Surrounding Supernova Remnant G43.9+1.6: Associated and Non-associated