Measuring accuracy of AACMM based on measuring force is focused in this work. The error of length measurement caused by measuring force is analyzed theoretically and experimentally. The local deformation of the probe and the measured object and the bending deformation of the measuring rod are the main factors affecting the accuracy of AACMM. The mathematical models of the local deformation and the bending deformation of the rod are established, with which the measuring results compensated with force error. Results show the error caused by measuring force can be compensated to a great extent: the average length measurement error is reduced about 82%, the maximum error is reduced by about 47um, which effectively improves the precision of AACCM.