Abstract
the paper has a detailed description of TDO (Test-Driven Outsourcing) mode, and has analyzed the entire task sets of the outsourcing team, proposed a new Software Process Mode, which is an evolution mode of the helix structure. This mode is different from the traditional mode of software project, so it is a new working mode. It is based on the ideas of BPO (Business Process Outsourcing). It may become the first one that assigns the task sets to the whole process of software development in an outsourcing team perspective. The mode of this paper is major for the heavyweight projects’ research and development, and can be better able to ensure the software quality, gives full play to the important role of testing in the software development process. Now, this mode has been adopted in practice projects, and achieved good results.