Abstract: Relationship between urbanization progress and desertification process has been studied by using RS, GIS and GPS techniques and statistic method from 1987 to 2003 in typical area of Kubuqi desert. Results showed that urbanization levels of Dalate Banner gradually increased in this period that varied from $9.1\%$ to $19.1\%$ . There was highest increasing period of the urbanization progress after 1998, the urbanization level of yearly average increase ratio was $0.7\%$ and higher than $0.53\%$ of that before Meantime changing trend of desertification degree which was quantitative express of the desertification in whole view was decreased from 0.269 to 0.214 during this period. The changing trend was induced by area fluctuation of sem i mobile and semi-fixed dunes because $2.6\%$ area of sem i mobile dunes and $12.3\%$ area of sem i-fixed dunes were unchangeable during 1987 to 1995. And most changeable area of the sem i mobile and the semi-fixed dunes transferred to other sand-dune types and cropland. A analysis of relationship between the urbanization progress and the desertification process indicated that there was significant linear relation in 0.05 level $\left[\mathrm{y} = -0.0038_{\mathrm{X}} + 0.3132\left(\mathrm{R} = 0.667 > 0.632 = \alpha_{0.05(8)}\right)\right]$ when the urbanization levels was less than $14\%$ . Conversely, there was not significant relation while the urbanization levels were more than $14\%$ . Therefore the paper could confirm that urbanization progress impact on the desertification process has period characteristic in sem i-arid zone of northern China

Key words: Urbanization, Desertification, RS. GIS and GPS, Kubuqi Desert