Abstract: The foamed pure Al was prepared by way of melt foaming process. Rapid stirring to add foaming agent was used to address the difficulty that the high decomposition rate of foaming agent is unfavorable to mixing the agent homogeneously into melt when the temperature is higher than the melting point of pure Al. How the foaming time affects the quality of the foamed pure Al was investigated. The results showed that the optimal processing parameters for the preparation of high-quality foamed pure Al are as follows: the adding amount of metallic Ca as viscosifier is 2-3wt%, stirring time for favorable viscosifying effect 4-5 min, adding amount of foaming agent 1.0-1.5wt% when the melt temperature is 690-700°C, stirring speed 1500-1800 rpm, stirring time 3 min, foaming agent adding time within 1.5 min and foaming time 4-5 min. Then, the foamed pure Al just prepared is cooled naturally. The compressibility test results revealed that although compressive strength of foamed pure Al is much lower than that of Al-Si alloy foam, the former is a typical plastic foam material which provides a wide range of plasticity.