With the transferring and development of the application of computer operating system from desktop to network, in the next generation of internet operating system, it is more and more important to consider the security of creating, running and exiting a thread on remote computer. This paper put forward the conceptions of "WorkerApplet",and designs a new running mechanism of thread that is implemented in Elastos. We change the object of thread for running from a "code of function" to a "WorkerApplet object". This work gives a new way to create, run, and exit a thread in remote system, especially which can be used to improve the security of system and data in the internet environment. And it perfects the running mechanism of thread in traditional operating system on the aspects of both the management of security and programming model.