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In order to meet measure the geometrical information of rock mass discontinuities��a portable controller is designed and produced�� Through experiment��it is proved that the controller is a stable��portable��and imaging clearly system�� Its mean square error of a control point indoor is ± 2 mm��and its mean square error of a control point in field is ± 3. 5 mm�� The controller can provide fast and effective control for close-range photogrammetry and meet the requirement of close --range photogrammetry��and it can be effective control for close --range photogrammetry to acquire geometrical information of rock mass discontinuities��