Many of researchers concerned jaws bases dimensions because of it's a part of craniofacial complex , its influence on the facial aestheticand functional portions .Though these dimensions were studied by Björk the width of the jaws bases in the different planes, its relation with craniofacial growth and development had been not studied . Aim: The aim of this study is to investigate the relationship of the length and width of the jaws in the frontal plane with Facial Growth Type in adults using Cone-Beam Computed Tomography scan (CBCT). Materials and methods: 33 adult patients (22 female, 11 male) with no prior orthodontic treatment were selected with age average 16 - 27 years ( mean age of 20.02 years, females average age was 20.15 years ; males average age was 21.84 years ) of age , were ordinary undergoing CBCT scan for non-orthodontics purpose. Cephalometric measurements determining facial growth type were performed according to Jarabak'sanalysis. Pearson's Correlation Coefficient was calculated to investigate the relationship between the CBCT jaws measurements and facial growth type according to Jarabak's analysis. Results :CBCT measurements of jaws' dimensions in the frontal plane showed no statistical significant differences. Conclusion:There is no relationship between jaws bases' dimensions in the frontal plane and facial growth pattern in adults orthodontic ally non-treated subjects.