In the application scenario of the internet of things,the operating system should ensure real-time response to key events.At the same time,it should also provide rich task management functions to meet various upper application requirements.In the paper,a performance analysis model of key event processing is proposed,and according to this model,the main direction of improving the performance of task scheduling system is analyzed.OneOS uses hybrid scheduling algorithm,priority bitmap algorithm,pre-computing task to be scheduled algorithm and hash bucket algorithm to improve scheduling performance.At the same time,through the optimization of lock granularity,the maximum interrupt response time is effectively reduced,and the task (the highest priority) that handles key events can respond quickly.Finally,the performance comparison data are given,which proves that the response performance of OneOS task scheduling system to key events has been optimized in similar products.