Abstract: Quality is the life of software,and the software testing is an importmant way to guarantee the quality. In this paper, starting from the characters of embedded system, the testing method for embedded software is presented. With the example of a wireless communication radio , the whole procedure that how to structure testing environment for embedded realtime system software by using Testbed and RTInsight and how to conduct the testing are described in detail, and some testing results for covering rate and performance testing are given too. Keywords: Embedded software; Software testing; Covering rate testing; Performance testing