In order to investigate the effect of feeding spray dried porcine plasma(SDPP) on the performance of piglets weans at 21 days of age, a feeding trial was conducted for 5 weeks. Dried skim milk(DSM) or soy protein concentrate(SPC) were used for comparative purposes. A total of forty-five piglets were divided into three groups. They were fed either DSM, SDPP or SPC at a 10% level during phase I (day 0 to day 14) and at a 5% level during phase II (day 15 to day 35). Results obtained are as follows. 1. Average daily gains of piglets fed SDPP were 0.16 and 0.35㎏ for the phase I and II (P$lt;.05), and were significantly higher than piglets fed DSM and SPC. Overall gain was 0.27㎏ which was about 35% higher (P$lt;.05) than that of piglets fed DSM or SPC. 7here was no difference in growth rate between piglets fed DSM and those fed SPC. 2. Average daily feed intake of piglets fed SDPP were 0.23 and 0.60㎏, respectively for phase I and phase II. Overall gain was 0.45㎏, which was significantly higher(P$lt;.05) than those of piglets fed DSM or SPC. Average daily feed intake of piglets fed DSM and SPC during the overall period were 0.38 and 0.36㎏. 3. F/G of piglets fed SDPP was better(P$lt;.05) than DSM or SPC. During the entire period, those were 1.66, 1.79 and 1.91, respectively for SDPP, SPC and, DSM. 4. The incidence of diarrhea was evaluated. As indicated by the values 7.3 for SDPP, 16.1 for DSM and 20.0 for SPC, piglets fed SDPP showed the lowest incidence of soft or watery feces(P$lt;.05). 5. The height of the villus of the small intestine naturally decreased at two weeks after weaning and then recovered at the end of the feeding trial regardless of treatments. The average height of the villus was the highest and their shapes were also very normal for piglets fed SDPP.