A distributed task system has a task transaction server and at least one task server. Instead of being merely passively called by the task transaction server for executing a task, the task server performs self-balancing according to task execution conditions and operation conditions of the task server. The task transaction server receives task requests from the task server, records the execution conditions, and provides feedback to the task server, and the task server executes the task according to the received feedback and the operation conditions of the task server. The task transaction server may determine if the task server can execute the task according to the execution conditions of the task, and feedback to the task server. A self-balancing unit of the task server may further determine whether the task server is busy, and if not busy, trigger a task execution unit of the task server to execute the task.