A triangular solar tracking photoelectric sensor is proposed and its structure characteristics and working principle are analyzed. The three-dimensional model

light intensity of photosensitive resistance and focus spot intensity of the sensor are established. The view field range of height angle and azimuth angle

coordinates of the focusing center spot and the influence of light intensity on the sensor are researched. The result shows that the range of the view field in height angle direction is within-90°

+ 90°

azimth angle range is within-180°

+

180°

which can satisfy requirement of the sensor view field. The best range of the incident angle is within-1°

+ 1° when the light intensity

value of the focus light spot is big. The corresponding spot edge is more complete and clear

which could improve the sensor tracking precision. This research could provide basis for this kind of solar tracking sensor application and development.