Abstract: In heterogeneous environment with data dependencies volume increases with the task,rapid growth and task processing time can make full use of computer resources, puts forward the problems can be decomposed job scheduling strategy,the task scheduling strategy according to the children in the DAG hierarchical relationships by using job scheduling,biodegradable characteristics,some of the graph can be decomposed DAG's job down into a two layer tree layer,thus make the system to adjust the dynamic load, and makes the computer system load balance of the computer,the optimum performance remarkably improved efficiency.