We present results of nearly six years of spectroscopic observations of the B [ e ] star V2028 Cyg .
The presence of the cold-type absorption lines combined with a hot-type spectrum indicate the binarity of this object .
Since B [ e ] stars are embedded in an extended envelope , the usage of common stellar atmosphere models for the analysis is quite inappropriate .
Therefore , we focus on the analysis of the long-term spectral line variations in order to determine the nature of this object .
We present the time dependences of the equivalent width and radial velocities of the H \alpha line , [ O i ] 6300 Å , Fe ii 6427 , 6433 , and 6456 Å lines .
The bisector variations and line intensities are shown for the H \alpha line .
The radial velocities are also measured for the absorption lines of the K component .
No periodic variation is found .
The observed data show correlations between the measured quantities , which can be used in future modelling .