Based on the data collected from 40 plots in 4 sampling areas, the β diversities of plant community in artificial fencing area in Yanchi County were measured by applying binary and numerical data. Results show that: (1) Cody index(β_C), as well as β_CJ and β_CS derived from Jaccard and Sorenson similarity indexes(C_j and C_s), are able to reflect the community changes as the time gradient. (2) In the numerical data measure methods, to measure with the relative coverage and importance value as an index, the result is more reasonable. (3) According to the results of Morisita-Horn index for the numerical data, the long-term cultivating is not conducive to plant community succession, which makes the communities more vulnerable to environment impacts.