Abstract: Product processing standardization is an important means to promote the quality of tea products, enhance the competitiveness of tea firms. Based on the micro-research data of tea firms in Jiangxi Province, this study analyzed the impact of product processing standardization on tea firms’ income using ordinary least square (OLS), two stage least square (2SLS) and treatment effects model (TEM), and further analyzed the difference of the impact of product processing standardization on tea firms’ income under different operating scales using the threshold effect model. It was found that (1) the product processing standardization had a significant positive impact on tea firms’ income, and the adoption of standardized production could help increase tea firms’ income, among which the blending process and sensory evaluation measurement dimensions had a significant impact, and the sales of tea firms adopting standardized processing methods could be 10.01% higher than the control group. (2) The impact of product processing standardization on tea firms’ income had scale heterogeneity, and the income increasing effect of product processing standardization of tea firms under moderate scale operation was obvious, and the income increasing effect of processing standardization under over-scale operation was not obvious. Therefore, the government should actively guide and promote the promotion and application of processing standardization of tea firms, while encouraging firms to incorporate the blending process into the standardization system. Advocating tea firms in the moderate scale range could expand the operating scale through a variety of ways to fully stimulate the operating income of product processing standardization.

Key words: product processing standardization, operating scale, operating income