Concrete is the most widely used construction material, but it is susceptible to crack formation. Due to the wide range of concrete uses, finding a way to prevent crack extension is desirable. Recently, a new solution is developed, called self-healing concrete. Self-healing materials are capable of healing damage automatically. The self-healing efficiency parameter is a representative parameter that quantifies the amount of healing in these materials. Self-healing materials are divided into two types of autogenous and autonomous. The encapsulated healing agent does one of the techniques of autonomous self-healing. Cracks fracture the embedded capsules, and healing is accomplished by releasing healing agents into the crack plane and bonding the crack faces. In this process, the diameter and number of capsules are critical. Experimental investigation of these materials is complicated and expensive, and hence, modeling of these materials is preferable. In this research, simulation of the healing process in encapsulation-based self-healing concrete and calculation of self-healing efficiency for three different percentages of capsules with constant diameter were done. Then, the capsule percentage effect on the stress-displacement behavior and the amount of efficiency were examined. Initially and for modeling concrete at mesoscale in Abaqus, the phase-field method was used. The limitation of in-hand phase-filed code to model the interphase layer resulted in inaccurate results. Therefore, instead of using the phase-field method, the concrete damaged plasticity model in Abaqus was used, and the results were validated. Then, a 3D model of concrete was simulated, and the effects of the interphase zone and the percentage of aggregate were investigated. Using this model and by adding specific amounts of cylindrical capsules, the self-healing concrete model was simulated. The effect of capsule percentage on the stress-displacement behavior of concrete was also studied. It was shown that the addition of capsules would decrease the strength and increase the concrete's ductility. The healing process was then simulated in two levels, and the stress-displacement curve for three models with different capsule contents was extracted. It was shown that the first strength decreased with the addition of capsules, but the second strength increased. Finally, the efficiency parameter was calculated. It was concluded that increasing the capsule content inside self-healing concrete will increase the efficiency parameter. Keywords: Encapsulation-based self-healing concrete, self-healing efficiency, simulation of healing, finite element method, concrete, phase-field model, concrete damaged plasticity model.