Abstract: The growth of ice particles by accretion of supercooled water droplets is the fundamental growth mechanism of natural hailstone. The relation between the growth conditions of accreted ice and its microphysical characteristics is studied to understand the microphysical processes of natural hailstone growth. Here, the design of equipment for experiments in accreted ice growth, the control and the measurement of the growth envirnmental parameters, and the results of these experiments are presented. Also, the relation between the microstructural parameters of accreted ice and their growth conditions is analyzed. Thus, the growth conditions of two natural hailstones from a hailstorm in Zhaosu, Xinjiang, in July, 1982, are analyzed by using the results presented in this paper.