Abstract: Computation of the results of two successive repeated second order triangulation survey, the strain and mechanical conditions and the horizontal crustal movement around the Yishu Eift Valley in Central and South Shandong have been analysed. Results of such a study show that (1) the average directions of the horizontal strain field are, N51E for the principal axis of compression, N 6 E and N 84W for the maximum shear strain, from which one can deduce the mechanical model of the crust of the region; (2) the horizontal crustal deformation of this region is charaterized by a typical left lateral pattern, taking the belt Guanyun-Linyi-Qufu as a transition.Based on such results, the portion for possible future earthquake occurrences of Central and South Shandong Province has been discussed.