Abstract: The experiment was conducted to study the slaughter performance and organ development in different month-old Shanbei white cashmere goats, to provide a theoretic basis for evaluating meat productivity and clarifying the optimal month of slaughter. The wether at 6, 8, 10 and 12 months old under farmer feeding conditions were used for slaughter test. The results were as follows. (1) Dressing percentage and meat percentage of the 10-month-old wether was the highest. Some indexes increased with the month age except dressing percentage, meat percentage and visceral fat percentage. (2) Rumen weight of the 10- and 12-month old wethers was significantly higher than that of 6- and 8-month-old wethers (P<0.05), while other gastrointestinal tract weight had not significant difference (P>0.05). Ratio of gastrointestinal tract weight in alive weight at 6 months old was the highest. Ratio of rumen weight in complex stomach weight was the highest, next was abomasum, omasum percentage was the smallest, while there was no significant difference in different months old (P>0.05). (3) Internal organs weight increased with the month age, and there was significant difference in different months old (P<0.01; P<0.05). Ratio of kidney weight in alive weight at 10 and 12 months old was significantly smaller than 6 months old (P<0.05), while not in other indexes (P>0.05). In summary, the wether had fast growth and good meat productivity at 10 and 12 months. So we conclude that the wether at 10 months can enter the market.