A digital photogrammetric workstation system is developed in P.R. China which performed automatic mapping from space imagery data efficiently. Since the earlier periods of space programs, surveyors and cartographers have been looking forward to the day when imagery data obtained from space can be utilized in mapping. With the launched and launching satellites, such as SPOT, MOMS, ERS-1, Radarset, etc., especially the announcement of Eyeglass, people are more interested in mapping using space imagery directly. This paper first compares two stereo imagery mapping methods (traditional photogrammetry and digital photogrammetry), then discuss the theory and practice in details in stereo viewing and automatic stereo measurement (image matching) of stereo imagery by Digital Photogrammetric Workstation.