The Bidirectional Reflectance DistributionFunction (BRDF) is a function of five real variables that defines how light is reflected at an optics surface.It is employed both in the optics of real-world light, in compute graphics algorithms, and in compute vision algorithms.The function takes an incoming light direction, outgoing direction and wavelength, and returns the ratio of reflected radiance exiting along to the irradiance incident on the surface from direction.The BRDF (Bidirectional Reflectance Distribution Function) of vegetation was particularly significant, when the biophysical and chemical composition of leaves were acquired with the optical properties of leaves and near-distance imaging technology at canopy level.One of major part in precision agriculture is the acquisition information of plant growth and the diagnosis of the growth condition applied by remote sensing technology and computer graphics.Measuring the reflectance and transmittance of leaves could indirectly study the interaction between light and plant leaves' cells.Moreover, we had access to the information about material and energy exchange process during the vegetation growth.Meanwhile, we could monitor and manage the different growth period of vegetation effectively.In addition, water or nutrient absorption on plants is closely related to leaf structure, biomass, pigment etc., leaf is an indicative organ for plant photosynthesis.Measurement of optical properties varied with external conditions, such as nutrient use efficiency, adaption to environmental stress, is of promising prospect.Traditionally, BRDF measurements were taken for one specific lighting and viewing direction at a time using gonioreflectometers.In order to shorten the time of measurement process and the experiment error, we designed a three-dimensional distribution of light equipment, which can be very good implementation in a receiving azimuth under multiple zenith angle of the reflection/transmission of light distribution function.Meanwhile, optical converter and spectrometer along with curved fixed frame rotating along with the circular bearing can obviously reduce the disturbance of optical fiber to the effects of the experiment.Moreover, this device can further improve the efficiency and the accuracy of the experiment.This paper is mainly used for the study of maize (Zea mays)leaves, use homemade device to obtain access to bidirectional reflectance distribution of maize (Zea mays) leaves, and discusses its optical distribution regularity.In this paper, we will analysis the maize (Zea mays) leaf bidirectional reflectance distribution, in the main plane direction, we will verify maximum reflectance value appeares in the direction of principal plane light incident side near symmetrical angle, reflectance value increases with the increase of light incident angle or not.In the vertical direction of the principal planes, reflectance distribution will be approximate symmetry, when light source is vertical incidence, the observation reflectance is higher than light source non-normal incidence zenith angle corresponding to the reflectance, and also the reflectance maximum value will appear near the light incident angle in a little range.This paper will also analyze the distribution of chlorophyll bi-exponential fit, and constructed a model based on vane component to simulation the bidirectional reflectance distribution of maize (Zea mays).