The multi-tapped wideband optical fiber delay line with the practical value and the adjustable step delay is introduced. Firstly, the advantage, working principle and basic structure of optical fiber delay line are introduced. Then the gain, bandwidth, dynamic range and distortion index of the optical fiber delay line are analyzed, and the design and implementation of the optical fiber distribution network are discussed. Finally, the multi-mapped wideband optical fiber delay line is tested, and the test method and result are given. The multi-mapped wideband optical fiber delay line is also compared with other international and domestic products and its application prospect and application field are described.