Abstract: The lower Paleozoic carbonatite gas reservoir in Ordos Basin is litho-stratigraphic trap gas reservoir of small thickness and great heterogeneity, thus difficult to develop effectively. This paper takes the eastern area of Sulige Gas Field as an example, using such dynamic and static data as drilling, well logging, seismic and well test data, etc. to analyze some main controlling factors of dolomite reservoir. It also clarifies the enrichment regularities and the characteristics of hydrocarbon accumulation and makes a synthesis forecast of favorable enrichment areas of tight carbonatite gas reservoir based on the reservoir seismic prediction Taking into considerations of hydrocarbon accumulation, controlling factors and store-permeability conditions, etc., the authors optimize the well location in the lower Paleozoic carbonatite gas reservoir. This Well Location Optimization technique is applicable to the eastern area of sulige gas field. It has improved the development of the lower Paleozoic carbonatite gas reservoir and provided technical guidance for the efficient development of the tight carbonate gas reservoirs.