目的 为实现猕猴桃可溶性固形物含量的快速无损检测。方法 实验采用反射式光谱采集系统获取不同成熟期“贵长”猕猴桃的反射光谱。比较3种光谱预处理方法(标准正态变换、多元散射校正以及二阶导数)对回归预测模型的影响;采用主成分分析对预处理后的光谱数据进行降维，并基于提取的特征变量，建立猕猴桃可溶性固形物含量的回归预测模型。结果 采用主成分分析，从1024个全光谱波段中提取了前16个主成分作为特征变量;基于特征变量建立的回归预测模型具有较好的预测性能，其预测集决定系数R2P=0.88，剩余预测偏差为2.94。结论 基于紫外/可见光谱结合主成分回归可以很好地预测猕猴桃可溶性固形物含量。

The work aims to conduct rapid nondestructive detection on soluble solids content of kiwifruits. Reflecting spectra acquisition system was used to collect reflectance spectra of Guichang kiwifruits in different maturity stages. The influences of standard normal variation, multi-scatter calibration and second derivative on the regression prediction model were compared. And the principal component analysis was used to reduce data dimension from preprocessing reflectance spectra. And a regression model was established based on selected characteristic variables for predicting soluble solids content of kiwifruits. The results showed that the first 16 principal components were selected as the characteristic variables by principal component analysis from 1024 full wavelengths. The regression model based on selected characteristic variables had a relatively good prediction ability (R2P=0.88, RPD=2.94). Therefore, it can accurately predict SSC of kiwifruits based on UV/Visible spectroscopy and principal component regression.