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Aiming at the given cloud computing method focus on saving power or reliability, not paying attention to the safety constraint, a work flow scheduling method based on cooperative tabu algorithm with safety constraint is proposed. Firstly, the DAG figure of work flow scheduling in cloud computing is defined, the safety constraint is described formally, the mathematic model of cloud computing work flow scheduling is built. Then on the basis of the classic cooperative tabu algorithm, the code of solution, fitness function, variable neighbor structure and double tabu table are designed, to realize the improvement of the classic tabu algorithm. Finally, the specific algorithm base on cooperative tabu algorithm is defined. The experiment is operated in the Cloud-sim environment, the result shows the method in this paper not only has the quicker convergence rate, and can get the more optimal scheduling scheme, satisfying the safety constraint need. Therefore, it is a feasible and applicable scheduling method.