According to different studies - especially geometric ones - different factors have been proposed that can affect horizontal dimension parameters. The aim of this study is claimed on the title. The study is of a descriptive and cross- sectional type.Fourteen lateral cephalogerams were selected to the sample consisted of 21 boys and 19 girls with the mean age of 9.83 years who suffered from different skeletal & dental malocclusion and were selected by simple sampling method.The linear parameters of wit's and wylie (which depend on occlusal & FH planes), the harvold parameter (which is independent of reference planes) & the proportional parameter of Schwartz were selected & their correlation with angular parameter of ANB were evaluated.

The results showed:1- All of the horizontal analyses showed statistically significant correlation.2- The ANB parameter showed high correlation with wit's, wylie, harvold & shawartz analyses and the correlation between ANB & wit's was higher than others.