In order to provide scientific basis for selection of grading parameters of jujube and formulation of quantitative grading standards, the main characteristic parameters of jujube produced in Xinjiang were measured and statistically analyzed. The changes occurring between characteristic parameters and the variation of each characteristic parameter of red jujube were also correlated. The data were analyzed and processed by box diagram, correlation diagram, cluster diagram, variance analysis and error analysis. Through clustering method, eight characteristic parameters of jujube were divided into five types, and the parameter errors produced by grading of different characteristics were analyzed and calculated. The results showed that all nine characteristic parameters except density were significantly affected by grading. The grade of jujube was increased with the decrease of standard deviation whereas a significant linear relationship was observed for the characteristic parameters and grading. There were different degrees of correlation between all nine characteristic parameters, the correlation between the contour area and contour perimeter was observed to be the highest, followed by length and length of the contour. Besides quality, density and short diameter, the density and other parameters were negatively correlated. Calculating the average error rate for different grades of characteristic parameters, it was concluded that the results were different while using different characteristic parameters for grading, the highest rate of misclassification was observed for density whereas the lowest was observed for perimeter, the higher the average error rate was, the worse the classification effect was.