Abstract: Fractured-vuggy carbonate reservoirs in the Tahe Oil Field are complicated.Acid fracturingis required in 70%of the wells.In some wells with deep burial depth and high formation temperature,the former acid fracturing failed to connect reservoir effectively since fractures had not penetratedenough far away,resulting in feeding-flow lack,low yield and inefficient.Main factors influencingreformation effects of massive acid fracturing reservoir have been concluded as follows:a)Petroleumenrichment extent of the region where wells locate;b) Reservoir generation degree of the well-control-ling region;c) Reservoir connection condition after the former acid fracturing;d) Scale and parametersof acid fracturing.