In this study, we have reconstructed Morph Sedimentary Characterization and Dating of Alluvial Fan Surfaces with the Purpose of Investigating Late Quaternary Paleo-Environmental Changes in the Kalshour basin in the presently semi-arid region that is located in the southern slopes of the Binaloud Mountain Range in northeastern of Iran. Based on morpho-sedimentary features, the surface of this Alluvial fan is divided into 8 morphosporic surfaces that called A1 to A8, which are divided into the following patterns: 1) Sedimentary surfaces due to high energy debris flow, 2) Sedimentary surfaces due to low energy of debris flow, and 3) Sedimentary surfaces due to floods without interference with debris flow. In general, the comparison of the results of chemical and physical analyzes shows: The A6, A2, A5 and A7 samples occurred as a result of debris flows in cold and arid climates with physical degradation and A4, A1, A3 and A8 samples occurred in warm and humid climate conditions with Continuous floods but less energetic. Also, the results of OSL dating method showed that 5 generations of terraces at the apex of the Boojmehran alluvial fan formed during the Pleistocene glaciation and three generations of these terraces belong to the Holocene era. However, the date of alluvial fan formation backs to the late Pleistocene. However, most of the geomorphic surfaces of the Boojmehran alluvial fan were formed in the first half of the Holocene period, indicating the humid climate of this area during the early Holocene.