The binary ice is a solid-liquid two-phase solution with huge minute ice crystals.The binary ice，with good flowing ability and large phase change latent heat，can be used as a good coolant for cold storage or large-scale and high-density cold energy transfer.In order to investigate the factors affecting the droplet temperature in binary ice preparation by vacuum method，a vacuum ice experimental bench，was set up to examine the dynamic characteristics of process，and collect relevant images and experimental data.The collected images are analyzed qualitatively.Experimental data collected are droplet temperature as a function of time at different environment temperatures，ambient pressures，water temperatures，water quality，sizes and initial falling velocities of water droplets which are compared with simulation data.The results show that the effects of environment temperature，water temperature，initial falling velocity of water droplets are small，while the effects of ambient pressure and water size are significant.The effect of water quality is special，mainly on the maximum subcooled degree of droplets.