Flow characteristics of turbulent pulsating flows in a square-sectional curved duct were experimentally investigated. Experimental studies for air flow were conducted to measure axial velocity profiles, secondary flow and pressure distributions in a square-sectional $180^{circ}$ curved duct by using an LDV system with a data acquisition and processing system which includes a Rotating Machinery Resolve (RMR) and PHASE software. Measurements were made at the seven cross-sections ITom the inlet ($phi=0^{circ}$) to the outlet ($phi=180^{circ}$) of the duct with $30^{circ}$ intervals. Pressure was measured by using a magnetic differential pressure gage. The experiment was conducted in nineteen sections from the inlet to the outlet of the duct at $10^{circ}$ intervals. Velocity profiles for turbulent pulsating flows were large at the outer wall for a bend angle of $phi=30^{circ}$ because of the centrifugal force. The velocity profiles were similar to those of turbulent steady flows. The secondary flow of the turbulent pulsating flow had a positive value at a bend angle of $150^{circ}$ without regarding the phase. The dimensionless value of the secondary flow became gradually weak and approached to zero in the region of a bend angle of $180^{circ}$ regardless of the ratio of velocity amplitude. The pressure difference of turbulent pulsating flows was the largest near the region of a bend of angle of $90^{circ}$ in the case of the middle region and became small beyond 90.