Mini IMU owns threeaxis gyroscope and triaxial accelerometer, so the robot posture can be displayed with it put in the robot. When crawlertype robot searches and rescues after catastrophe, the posture is vital to the unfamiliar topography. To solving this problem, we connect Mini IMU with main control circuit board,and the posture data within μC/OSII operation system of Freescale singlechip are sent to control box. The control box translate the data after receive them. Finally the robot posture can be displayed by OpenGL technology on the screen of the control box. When the design is completed, the robot was controlled to rotate, climb, and comparing the data received in the upper computer. The result of experiment is analyzed and assessed according to the error analysis. The system is timely, accurate and reliable.