The object of this study was orchard soil in Zhengchuan Village of XinGuo Town in Qin’an County of Gansu Province, statistical analysis was applied to explore the correlation of soil salt ions of a test site in semiarid saline area, 500 samples collected from 0 ~ 120 cm layer of soil were analyzed in laboratory. The results showed that the predominant anions in soil salt were HCO3- and SO42- while the predominant cation was Na+. CO32- showed a significantly negative correlation with HCO3- and Mg2+ but an extremely significantly positive correlation with Na+; HCO3- showed a significantly negative correlation with Cl- but an extremely significantly positive correlation with Mg2+; Cl- showed a significantly positive correlation with SO42-, Ca2+, Mg2+ and Na+ and an extremely significantly positive correlation with Ca2+ and Na+; SO42- showed an extremely significantly positive correlation with Ca2+, Mg2+ and Na+; Ca2+ showed an extremely significantly positive correlation with K+ but a significant negative correlation with Na+; a significant negative correlation existed between Mg2+ and K+, an extremely significant negative correlation existed between K+ and Na+. Similar characters of movement of Cl-, Mg2+, CO32-, Ca2+, K+ and HCO3- were found by clustering analysis. The analytical results of correlation analysis and partial correlation analysis were compared and significant differences were found between the two methods. Partial correlation analysis could eliminate more the effect of others variable, thus could depict more exactly the correlation of multivariate analysis between two variables.