[Objective] To study the effects of instant asparagus powder (IAP) on immune function of mice. [Method] According to the method recorded in the Technical Standards for Testing & Assessment of Health Food (2003), the mice were given instant asparagus powder (referred to as the extract of Asparagus officinalis) for successive 30 days by intragastric administration. [Result] Instant asparagus powder could improve evidently functions of cellular immunity, humoral immunity, mononuclear macrophage and activity of NK on mice. But apparent effect to weights of spleen, thymus and body were not seen in the trials. [Conclusion] Instant asparagus powder can improve the immune function of mice. [Objective] To study the effects of instant asparagus powder (IAP) on immune function of mice. [Method] According to the method recorded in the Technical Standards for Testing & Assessment of Health Food (2003), the mice were given instant asparagus powder (referred to as the extract of Asparagus officinalis) for successive 30 days by intragastric administration. [Result] Instant asparagus powder could improve evidently functions of cellular immunity, humoral immunity, mononuclear macrophage and activity of NK on mice. But apparent effect to weights of spleen, thymus and body were not seen in the trials. [Conclusion] Instant asparagus powder can improve the immune function of mice.