Using the data collected, The primary data in 2001 are collected. The estimation of NPR is conducted in light of the identical quality of the same products at a precise point time in the same place, differentiating the export products and import products.

• 本研究采用2001年的实际调查资料，依据同一交易时间，同一地点，同一品质质量，并区分进口品和出口品，对我国主要农产品的贸易保护率进行了测算。