ABSTRACT: Cloud Computing is the network-based computing service to the user supported by internet. The computing service may be a data storage, hardware, software or any internet-based service required for an individual user or a business organisation. The cloud services are On-demand services available to the users at anytime and anywhere. The Cloud Service provider is responsible for monitoring data, firewalls, intrusion detection management and other security concerns while providing cloud-based services to the end users. There are many challenges in selecting trusted cloud service. Many Cloud Service Selection Procedures are there which are based on data Models, decision making procedures, context and parameters of cloud services. In this paper, proposed a trusted Cloud service based on score based algorithm.