Crack resistance of concrete face slab is very important for the service life of concrete faced rockfill dam(CFRD).The effects of fly ash,MgO expansive agent, and shrinkage-reducing admixture(SRA) on the mechanical properties, drying shrinkage and crack resistance of face slab concrete are studied and compared with the reference concrete.The results show that the addition of 20% fly ash (by weight of binder) enhances the strength of concrete at a late age. In contrast, the addition of a 6%MgO expansive agent or 1%SRA reduces the compressive strength, splitting tensile strength and ultimate tensile to some degrees at various ages.The incorporation of 20%fly ash,6%MgO expansive agent, and 1%SRA can reduce the dry shrinkage at various ages and improve the early crack resistance of concrete, while the incorporation of 6%MgO expansive agent is more conducive to inhibiting the shrinkage development and improving the crack resistance of concrete than the addition of 20%fly ash or 1%SRA. Concrete face rockfill dam (CFRD) is a rockfill dam with rockfill as the main force and the upstream concrete face as the anti-seepage main body. Due to its characteristics of good safety, strong adaptability, short construction period and low cost, concrete face rockfill dams have become one of the most widely used types of dams in dam design. Concrete slabs are typical slender and strip-like structures that are prone to cracking due to temperature changes, volume deformation and dam foundation settlement. For the dam body, if there is a crack in the concrete face, it will destroy the integrity and durability of the dam body structure, and the gap caused by the cracking of the face plate may allow the outside water to seep into the concrete, which directly causes the leakage of the dam body. Therefore, improving the crack resistance of concrete face slabs is an important issue related to the safe operation of concrete face rockfill dams. The current engineering practice and research show that the main technical measures to improve the crack resistance of face concrete include controlling the quality of concrete raw materials, optimizing the concrete mix ratio, adding fly ash and adding appropriate amount of fibers.The main components of concrete shrinkage reducer are a kind of polyalcohol or polyether organic compounds and their derivatives. Studies have shown that the addition of shrinkage reducing agent can reduce the surface tension of concrete pore water, thereby reducing the shrinkage stress generated when the capillary pores lose water, and improving the crack resistance of concrete to a certain extent. The addition of MgO expansion agent during concrete preparation is a common method to control cracks. Since the MgO expansion agent will produce a certain volume expansion during the concrete setting and hardening process, it can compensate for the concrete shrinkage, including temperature shrinkage, drying shrinkage and self-shrinkage, thereby reducing the occurrence of concrete cracks. At present, MgO expansion agent has been successfully applied to the mass concrete of hydropower station and achieved good anti-cracking effect. However, there are few studies on the effect of shrinkage reducer and MgO expansion agent on the crack resistance of face concrete.