Abstract: In order to rapidly measure the geometric parameters of orchid, an image acquisition platform was built and a set of algorithm for measuring geometric parameters of orchid flower was designed with the Golden Phalaenopsis as the research object. The algorithm includes Canny-Harris algorithm to detect orchid corner point, K-means algorithm and RGB threshold segmentation algorithm to segment orchid in picture, and MER algorithm and traversal algorithm to measure specific geometric parameter of orchid. Through recognizing and testing orchid with the algorithm, the test results show that it only takes about 10 s to measure a single orchid plant, the algorithm measure rate is nearly 60 times higher than the manual measurement rate, and the measurement data can provide a judgment basis for orchid selection and breeding.