To investigate the nucleation performance of biogenic ice nucleus Snomax, a laboratory research was carried out in an isothermal cloud chamber. The nucleation quantity, rate, threshold temperature of Snomax were obtained. The laboratory research results indicate that the nucleation rate of Snomax ranges from 108/g to 1011/g at the temperature range of -4 to -18 ℃, and the ice crystal morphology after Snomax catalysis is seriously influenced by the cloud chamber temperature, super cooled water content, and mass concentration. Besides, the nucleation property of silver iodide (AgI) pyrotechnics was tested at the same conditions. Results show that the nucleation rate of AgI is about 3 to 4 orders of magnitude higher than that of Snomax. But the hydrophilic Snomax is much more nucleatingeffective and environmentalfriendly. In comparison with AgI pyrotechnic, the possible application of Snomax in weather modification is discussed.