Abstract: SPECT/CT imaging was conducted on an ectopic kidney in a patient with congenital anal atresia. Most cases of ectopic kidney are found by chance during physical examination given the lack of the specific clinical symptoms of this condition during its early stage. At present, the diagnosis of ectopic kidneys mainly depends on ultrasound and CT. Renal dynamic imaging, however, provides advantages for the evaluation of the individual functions of ectopic kidneys. Gate's method was used to detect the glomerular filtration rate of an ectopic kidney. Literature review was performed to obtain a deep understanding of Gate's method. The following guiding conclusions were drawn:1. The co-occurrence of other organ malformations in newborns with kidney malformations should receive close attention. Early detection and intervention are necessary to manage ectopic kidneys. 2. SPECT/CT enables the advantageous one-stop diagnosis of the morphology and function of ectopic kidneys. 3. Gate's method requires proper correction for the glomerular filtration rate determination of kidneys with special characteristics.