Sasanian fire temples with Four Arches plan include central platforms with stone or plaster bases around it and the base of fireplace located in the center of the building. the writer studied the remains of a Sassanid fire temple. Kaki fire temple is 4 km southeast of Kaki city of Dashti city, 11 km northwest of Kanari village in Bardkhon section of Bandar Daeir and 27 km east of the coast of the Persian Gulf. Inside this fire temple and in the middle part of Four Arches, the remains of the platform surrounding the fire place attract attention. This article is presented with the aim of studying and comparing the architecture of Kaki fire temple with fire temples of different regions. This research was conducted as a fundamental research by both documentary and field methods and tries to carefully consider the architecture, usage and history of the Kaki fire temple building. Also, the fire temple building is compared with the existing examples and the type of fire burning in it is studied. As a result of this research, the mentioned building is introduced as a fire temple of the Sassanid period with a local fire and a four-arches architectural plan with a circular corridor around it, similar to other fire temples of the Sassanid period. Also, as a result of the study of this fire temple, the use of Gopals from the Persian Gulf is suggested for the first time as the foundation of the platforms around the fire Place.