Abstract: Experimental study of performance parameters of a fluid densimeter with vibrated conduit was carried out,using single-phase water and air-water two-phase flow with different vapor quality to modulate the fluid of different density.The results indicated that the parallel vibrating model of the vibrated conduit is more suitable for measuring the fluid density than the wiggling mode around the center of the vibrated conduit.The measuring of the fluid density is under the influence of the oscillation of the system and the pressure of the fluid.System oscillation should be limited and expressions modified by fluid pressure are presented.The experimental results also indicated that the change of the flowrate nearly has no impact on the performance parameters of the fluid densimeter with vibrated conduit.