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Road Solo-Yogyakarta KM 9-15 is the national highway which supports the traffic of goods and services, but many passing goods transport vehicles do not match the allowable load. As a consequence, the damage on the pavement occurred. Therefore, this study aims to know the effect of overloading on design life and pavement thickness. This study used the method of Binamarga to analyze the reduction in design life and the effect of pavement thickness caused by overloading. The analysis was carried out by using the formula of design life decreasing with the value of Cumulative Equivalent Standard Axle (CESA) for overloading and standard load. Based on the 2002 Binamarga method, the design life value is reduced by about eight years,from the previously determined is 20 years. Moreover, based on the analysis on pavement thickness of 20 years design life by using Binamarga 2002 for standard load, it showed that pavement thickness is needed for a surface layer of 24.5 cm (Laston). Also, the base course layer is 11.5 cm (Sirtu Class A), and the subbase course layer is 22 cm (Sirtu Class B). At the same time, for overloading, the analysis result showed that it was required the pavement thickness for the surface layer of 27 cm (Laston), the base course layer of 27 cm (Sirtu Class A) and the subbase course layer of 6.5 cm (Sirtu Class B). These results indicate that overloading causes a reduction in the design life of the pavement and an increase in the thickness of the pavement.