: Disparities Of Development Analysis (Study in East Java Province 2005-2011). The purpose of this studying this research to find out some disparity which is happened in East Java. Besides that, to know Kuznets hypothesis occur happen in this region and the effect of PDRB variable, PAD, DAU, and IPM about disparity of development. The data in this research use the data from 2005 until 2011. The analysis use in this research is Williamson index, Kuznets hypothesis, and bifilar regression with SPSS assistance. From this analysis produce disparity percentage appertain low, caused index percentage Williamson close on 0. Besides that, Kuznets hypothesis also occur happen in this province. From four variables above, PAD and IPM have negative influential to disparity of development. Whereasfor PDRB and DAU undetected effect because not yet measures in classic assumption experiment.