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In this paper, we briefly introduce the basic questions in the measurementsof solar magnetic fields and the possible error sources due to theapproximation of the theory of radiation transfer of spectral lines in thesolar atmosphere. We introduce some basic research progress in magnetic fieldmeasurement at Huairou Solar Observing Station of National AstronomicalObservatories of the Chinese Academy of Sciences, especially concerning thenon-potentiality in solar active regions, such as the magnetic shear, currentand helicity. We also discuss some basic questions for the measurements of themagnetic fields and corresponding challenges for the future studies.

From Polarimetry to Helicity: Studies of Solar Magnetic Fields at the Huairou Solar Observing Station