Abstract: In the development of embedded application, the embedded operating system becomes more important. Its development environment is also an essential part. RTEMS is an open embedded operating system. The design of development environment for RTEMS was implemented. The methods include: connecting the host and target machine by ethernet or serial port, establishing the cross compile tools, remote downloading and debugging by various communication protocols, setting up configuring and scaling of modules, etc. This environment is easy to handle and of graphics user interface. This design provides an embedded development platform and spreads the use of RTEMS. The system has been in use in fields of education and research.