Abstract: The optimization of manmachine interface is very important for improving the efficiency of the machine system and increasing the comfortable and safety of operation. The space position is one of the main factor. Its accurate measurement must be much helpful to the design,manufacture and improvement of the system. In this paper, photogrammetry, computer vision and image processing techniques were used to measure the space position. The instruments were composed with a popular video camera, an image converter and a computer. The paper discussed the following items: the processing of image digitalizing; a mathmatic model of photogrammetry and the solution method; the linefit error model based on experiment data; a method of reducing the error; the design and arrangement of a three dimensional field used for calibration. Finally,a computer software was developed and its application instance to measuring a manmachine interface experimental setup was given. The results indicated that the measured error is less than 2 %, which can satisfy the engineering requirement. The experimental result indicated that this noncontact measurement system can fast and conveniently be used in the measurement of space position of manmachine system with lower cost. Furthermore, it can be used in movement measurement for manmachine system if with two camera.