Microangiograhy may be defined as a branch of radiology which deals with the production and study of roentgenograms of thin sections of tissue for evaluation of microvasculatures. Its main advantage is that it permits study of a vascular system in continuity so that the pattern and overall architecture can be appreciated. Authors performed the microangiography to study the irradiation changes of kidney in 30 rabbits. Following local irradiation of 2000 rads to one kidney of each rabbit, both normal and irradiated kidneys of each rabbit were studied. The results are as follows : 1. In the normal kidneys there is good filling of interlobular arteries, afferent arterioles, glomeruli and efferent arterioles. 2. In the early stage(1 month) after irradiation there appears to be no identifiable abnormal findings except slightly poor filling of glomeruli in the irradiated kidneys. 3. 5 months after irradiation the ratiation-injured kidneys reveal intense curiling and spralling of int rlobular arteries and afferent arterioles with poor filling of glomeruli. 4. Microangiography, as expected , proved to be of great value in evaluation of the microvasculature of the idney.