Abstract: DS225 rotary, absolute, electric encoder is ideally suited to mechatronics app lications. It is used to achieve the perspective of absolute position detection. But the comp lex p rocess of looking2up table resulted in re2 ducing the software flexibility to increase storage space and thus increase the cost of hardware. Through analysis of the two workingmodel ofDS225 p roposed algorithm to imp rove the p rogram, the p rogram uses coarse model angle to calculate p redicted signal cycle serial number of fine model, combining with fine model angle to calculate absolute angle. In addition, DS225 output 22channel analog signal amp lification level in the former treatment due to the dis2 creteness of the device will certainly create deviations between 22channel. The software adjust the ratio between the signal factors to eliminate the differences between signals. This app roach reduces costs to enhance the adap tability of the p rocedures and imp lementation efficiency. Experiment results show that the method can save storage space of E2Forms and willmake an error control in less than 3 ‰.