Abstract: A method for detecting Bacillus Anthracis comprises steps: obtaining DNA of a sample; respectively mixing the DNA with Primer Sets pXO1, pXO2 and PL3 to form a first reactant mixture, a second reactant mixture and a third reactant mixture, wherein the Primer Sets pXO1, pXO2 and PL3 are respectively sequences specially designed for pXO1, pXO2 and PL3; respectively undertaking PCRs of the first reactant mixture, the second reactant mixture and the third reactant mixture; and detecting whether the sample contains sequences of pXO1, pXO2 and PL3 simultaneously to determine whether the sample contains Bacillus Anthracis. The present invention detects whether the sample contains pXO1, pXO2 and PL3 simultaneously to determine whether the sample contains Bacillus Anthracis and further uses specified primer sets to undertake PCRs and increase the sensitivity and specificity of detection. Thereby is increased the speed and accuracy of detection.