Abstarct: Chehel-Dokhtar area in thenortheast of Shahrood, is a part of south margin the eastern Alborz. Stratigraphic studies illustrate outcrops of Paleozoic, Mesozoic and Cenozoic rock units in this area with prevailingnortheast-southwest to east-west structural trend. All of the studied folds,except for Sorkh-Cheshmeh anticline which is the result of folding inLower Carboniferous limestone (Mobarak Formation), are production of folding in Tertiaty formation. baxsed on interlimb angle of fold (Fleuty 1964), most of the fold have taken place in open field and with less frequently is gentle. baxsed on the dip of axial plane and plunge of hinge line, the studied fold are classified into two domains: 1- Upright sub-horizontal, 2- Upright gently plunging and just a few located in rank of steeply inclined gently plunging. The faults that their strikes are northeast-southwest such as Abr, Mighan, Khij and Kalateh Bon, have left lateral reverse mechanism and those with north-south trend include right lateral mechanism. This geometrical arrangement and kinematics of faults is compatible with regional left lateral transpression. Geomorphologic features of studied area highly affected by tectonic elements such as folds and faults. Reverse faults and folds are main factors in creating morphology of north part, but plains in middle and southern parts are largely created by Khij and Mighan with prevailing strike slip component. Evidences of neotectonics activities are observable with some geological records such as fault escarpment, dislocated streams, travertine forming spring, displacement of alluvial fans and also deformation of young formaton and quaternary sediments.