This experiment was conducted to study the effects of dietary zinc level on growth performance, cashmere performance and cashmere growth-related hormone contents of Shanbei white cashmere goats during cashmere growing period, in order to determine the optimal dietary zinc level of Shanbei white cashmere goats during cashmere growing period. The experiment was designed in a single factor random block. Thirty-two Shanbei white cashmere goats at 8 months of age with physical fitness and similar weight were selected and divided into 4 groups with 4 replicates per group and 2 goats per replicate. The goats in control group (group Ⅰ) were fed a basal diet containing 28.57 mg/kg DM zinc, and the goats in experimental groups (groups Ⅱ, Ⅲ and Ⅳ) were fed the basal diet supplemented with zinc sulfate (feed grade), and the dietary zinc level of the experimental diets was 50, 70 and 100 mg/kg DM respectively. The pre-test period was 15 days and the formal test period was 6 months. The results showed as follows:1) dietary zinc level had no significant influences on dry matter intake (DMI) and feed/gain (F/G) of Shanbei white cashmere goats (P>0.05). Goats in group Ⅲ had the greatest average daily gain (ADG), and the ADG in group Ⅲ had significant difference compared with group Ⅰ (P<0.05), while had no significant difference compared with groups Ⅱ and Ⅳ (P>0.05). 2) Dietary zinc level had no significant influences on cashmere diameter at initial experiment and last experiment and cashmere production (P>0.05). Cashmere length in group Ⅲwas significantly higher than that in group Ⅰ (P<0.05). Cashmere length at last experiment in group Ⅳ was significantly higher than that in groups Ⅲ and Ⅱ (P<0.01 and P<0.05, respectively). Cashmere growth and cashmere growth rate in group Ⅲ were significantly higher than those in groups Ⅰ and Ⅳ (P<0.05), and no significant difference was observed between groups Ⅲ and Ⅱ (P>0.05). 3) With the succession of cashmere growing period, melatonin (MT), insulin like growth factor-1 (IGF-1) and growth hormone (GH) contents in serum of goats showed increasing trend, and serum prolactin (PRL) content was showed decreasing trend. Dietary zinc level had no significant influences on serum MT and PRL contents in the whole experiment period and GH content in the mid-term experiment (P>0.05). Serum IGF-1 content in the mid-term experiment in group Ⅲ was significantly higher than that in group Ⅳ (P<0.05). Serum IGF-1 content in the last experiment in group Ⅲ was significantly higher than that in groups Ⅰ and Ⅳ (P<0.05). Serum GH content in the last experiment in group Ⅲ was significantly higher than that in group Ⅰ (P<0.05). In summary, the optimal dietary zinc level of Shanbei white cashmere goats during cashmere growing period is 70 mg/kg DM.