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When cast two different types of concrete in the structures or cast new concrete over old concrete it should be act monolithically. As the load applied a shear force between them will cause slip, so treatment or connectors should be used on the interface. The self compacting concrete (SCC) used widely due to its good properties as spreading and passing ability through congested reinforcement. The aim of the present research is to study the shear transfer between precast normal concrete and self compacting concrete by using several methods for surface treatment such as shear-key, sand-blast, chipping or using steel stirrups. And also to study the effect of the compressive strength on the shear force is carried out. The results were shown that the best treatment method of the interface surface to get high shear force and less slip is the sand-blast or using two 6mm reinforcement, and the compressive strength of SCC and normal concrete were enhance the shear force. [ABSTRACT FROM AUTHOR]