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The computing grid is a distributed parallel processing system that share and choosing resources dynamically and provide need of user operation power, cost and quality .grid management resources does as a diagnostic and assigning resources scheduling and resource monitoring in grid . Scheduling process directs tasks to suitable resources. It must take place some how that load work distributed equally on resources to get the maximum interest out of existed resource, establishing load balancing is one the important performance factors in grid resource management efficiency. in this paper , loading indexes and new resource conditions in accordance with synchronous neighbourhood was suggested and also for resource allocation ,a model in accordance with tree and probabilistic scheduling algorithm with load balancing purpose was suggested , that in this algorithm workclass, cost, deadline and herd behaviour have considered. Probabilistic algorithm chooses the resources that have better past and least completion time And leave the duties to it, in case of execution or non-execution on the resource the source will give a reward or punishment. The main purpose of this algorithm is establishing load balancing and reducing the response time and task failure percentage.