Abstract: A micro-plot experiment was conducted to study the effects of bast fiber mulching film returning (0 to 10 times) on the nutrients and available heavy metals in soil, the growth, and nutrients and the heavy metals contents in pakchoi. Five treatments were performed, including 0 (T₀), 35 (T₁), 70 (T₂), 175 (T₃) and 350 g·m^-2 (T₄). The above five treatments represented the application times of bast fiber mulching film as 0, 1, 2, 5, and 10 times, respectively. The results indicate that the soil alkaline hydrolysis N, available P and K significantly increased by up to 4.47%, 20.70% and 24.62% (P < 0.05), respectively, compared with the control (T₀). The bast fiber mulching film returning promoted the growth of pakchoi, with the highest increase in fresh weight of pakchoi and the contents of N, P and K in pakchoi by 110.79%, 18.31%, 14.76%, and 39.99% (P < 0.05), respectively. And these physiological properties were increased with the increasing of the bast fiber mulching film returning times. There were no significant difference on the change of available Pb, Ni and Zn in soil and the Zn and Mn concentration in pakchoi under these treatments. Although the content of Pb and Ni in pakchoi were significantly decreased by up to 24.95% and 21.77% (P < 0.05). The Cd concentration was slightly increased after the bast fiber mulching film returning. In conclusion, the bast fiber mulching film returning can increase the soil available nutrients contents, and promote the growth and the absorption of N, P and K of pakchoi, but has no significant influence on the micronutrients or heavy metals availability.