This article is partial sumary from the full research of urban inequality. The objective of this research was to collect and classify all linkage researches of urban inequality to identify the gap of inequality studying. Data collecting was relied on the 542 paper which published on the data base of The National Research Council of
Thailand (NRCT) and The Thailand Research Fund (TRF). The data were analyze from
the data repetition by percentage. This study has founded that the group of research
divided into 11 typology of urban inequality group: income, opportunity to access,environment, geography, public access, education, community, safty, health, public administration, and data subscribe. The research gap of urban inequality has divided in 4 topics: income, data subscribe, public administration, and education research. Inaddition, the description study of urban inequality has few number of researches.