There are provided an image acquisition system capable of storing high-accuracy measurement of changes in the shape of a plant growing process in image information with high accuracy and an analyzing method for analyzing an acquired image to analyze plant growing. <??>There is provided a plant growing analyzing system having operation detection means (15) of a conveying mechanism (9) of a plant (13) in order that an observed plant in an image is photographed at a constantly fixed position; a position detecting mark (14) in the acquired image; a computation part (16) for evaluating detected data to control a conveying amount; and a conveying control part (10), wherein the growing process of many plants is stored in image information in a long period, and the stored image is used to realize high-accuracy measurement. <IMAGE>
