In order to improve the current receiving quality of pantograph/ flexible catenary system, the pantograph/flexible catenary operation simulation test rig was established to study the influence of rail transit catenary parameters on the contact force of pantograph/ flexible catenary by physical and virtual combination method, and then the current receiving characteristics of the pantograph/flexible catenary was studied. Researches showed that when flexible catenary structure height was 1.5 m, span was 62 m, the tension of carrier cable and contact wire was 15 kN, carrier cable line density was 0.8 kg/m, contact lines density was 1.5 kg/m, and contact wire sag was 45 mm, for single cosine wave was not smooth, the wavelength should be greater than 3.2 m , and the sine wave was not smooth, wavelength should be greater than 5.5 m, the current receiving was the best for pantograph/ flexible catenary system.