Clinical observation revealed that combined use of Decoction of Radix Astragali seu Hedysari and Poria withlarge dose of Cisplatin.none of the cases showed ab-normality in BUN,Cr.with improvement of biochemi-cal indices,there was also diuretic actions observed.Ahgdraton contrel group revealed worse result.The ex-periment proves that the Decoction is capable of pre-venting and ameliorating the harmful effect on kidneyinduced by Cisplatin in rats.