[en] Two types of motional Stark effect (MSE) polarimeters were detected and the pilot experiments of measuring the magnetic pitch angle are carried out in the HL-2A tokamak. The main part of the first type consists of 4 polarizers and a spectrometer, and the accuracy of ±0.15 ° can be obtained. The pitch angles of magnetic field are achieved by 7 spatial channels covering 24 cm major radius with time resolution of 40 ms. The profiles of safety factor are obtained by combining with the equilibrium and reconstruction fitting code (EFIT). The position of q = 1 surface is well consistent with the results measured by soft-X array. The other one based on a dual photo-elastic modulator (PEM) can obtain the accuracy of ±0.15 ° in the calibration experiments. The deviation angle between analyzing polarizer axis and the angular bisector of the dual PEM influences heavily on the linearity and the accuracy of the system. Time resolution of 20 ms was obtained for one channel during the pilot experiments. (authors)