This letter aims to determine the scope of the compulsory insurance (Third Party) from the civil responsibility about the traffic accidents, according the casualties in persons and vehicles. The letter is divided in two chapters to achieve the specific aim, the first chapter is about the scope related with persons, the second chapter is about the compulsory insurance related the damages, the two chapters are preceded with an introduction. The introductory research is divided in to two demands: the first is about the concept of compulsory insurance and its importance, the second is about (the vehicle, the accident and the road). The first chapter 1 discussed the scope of the compulsory insurance which is about persons, this chapter is divided in three researches, the first one the others concept advantage of compulsory insurance which is about the third party according the Omani legislation that leads to an important result, it keeps away the owner of the car and the members of the family from the insurance coverage, I discussed in the second research how these people benefit from the compulsory insurance. But the third research I discussed the others error to obtain compensation. Chapter three I discussed the scope of compulsory insurance towards damages which is covered, in the second research I mentioned the excluded damages. Finally I concluded my study by an end included the most important results and recommendations.