We investigated systimatically the electrical properties of the barium metaborate crystal in low temperature phases and found a new type of pyroelectric crystal materials, the single crystal samples of which grew in our laboratory. According to experimental investigations on many of its physical propenties, such as the dicalectric constant, de-resistivity, loss angle, pyroelectric coefficient, Cp, as well as transparency, it may be expected that this material would be useful for application in high power infrared pyroelectric detectors.