Abstract: Acid-fracturing is an important technique to stimulate in Lunnan oil field. The Ordovician carbonate reservoir of Lunnan buried hill is deeply buried underground. The reservoir temperature is high, and fractures develop. These reservoir characteristics bring difficulty to acid-fracturing treatment and material. This paper analyses these difficulties in acid-fracturing in carbonate reservoir of Lunnan buried hill. On the basis, the paper particularly analyzes types of deep acid fracturing technology, pump process, parameters during the job, types of drainage and so on. At last, the paper gives some suggestions. The paper can give the guidance for the stimulation of homologous reservoir.