Helicopter's blade during its rotation accomplishes a ccomplex spatial movement and deformation. The first ]part of the report is devoted to Blade Deformation IMeasuring System (BDMS), which was developed to imeasure parameters of blade movement and its bendingtwisting deformation. This part describes the imeaswement system and the basic measurement ]principles. Results of the laboratory investigations are &cussed as well. Pre prototype of the BDMS was investigated in TsAGI's T-101 wind tunnel. BDMS ]provides twisting deformation measurement with mean :squared deviation (MSD) about 3-6 angular minutes and Ihem displacement measurements with MSD about 0.3-0.6 mm for real scale helicopter rotor. The second part describes d t s of the evaluation tests with Pressure ;Sensitive Paint, which were conducted by pressure imeasmment extension of the BDMS. The first results obtained during the wind tunnel tests are presented and compared with pressure port data.