This experiment was conducted to study the effects of dietary different silkworm excrement supplemental levels on growth performance, body measurements, slaughter performance and viscera indices of geese at the age of 14 to 70 days, and to explored the dietary optimal silkworm excrement supplemental level for geese. Three hundred and thirty 11-day-old healthy male Yangzhou geese with similar body weight were randomly divided into 5 groups with 6 replicates per group and 11 geese per replicate. Geese in the control group were fed a basal diet, and the other geese in the experimental groups were fed experimental diets supplemented with 3%, 6%, 9% and 12% silkworm excrement, respectively. The experiment lasted for 56 days. The results showed as follows: 1) compared with the other experimental groups, dietary supplemented with 9% and 12% silkworm excrement significantly decreased the body weight of geese at the age of 28, 35, 42, 49, 56, 63 and 70 days (P<0.05), and significantly decreased the average daily gain of geese at the age of 14 to 28 days, 29 to 70 days and 14 to 70 days (P<0.05), but significantly increased the ratio of feed to gain (P<0.05). 2) Compared with the control group, dietary supplemented with 9% and 12% silkworm excrement significantly decreased the shank circumference, breast width, breast depth, body length and half-diving depth (P<0.05). 3) Dietary supplemented with silkworm excrement only had significant effect on the percentage of breast muscle of geese (P<0.05). 4) Dietary supplemented with silkworm excrement had significant effect the duodenum index, jejunum index, ileum index, cecum index and rectum index (P<0.05). It is concluded that dietary supplemented with 3% to 6% silkworm excrement has no negative effect on growth performance, body measurements, slaughter performance and viscera indices of geese, while it can improve the intestinal growth and development of geese. So the dietary optimal silkworm excrement level is less than 6% in the production practice of geese.