Linear Polarization of HD37776

The rst observations of linear polarization in the lines of a unique He{rich star HD 37776 with a complex structure of magnetic eld were carried out with the 6{m BTA telescope of the SAO RAS using the Main Stellar Spectrograph. The data analysis reveals an almost zero signal of the Stokes Q and U parameters in 4 dierent phases. We hence need to reconsider the model of magnetic eld of this star.