Abstract: Fiber-distributed acoustic sensing (DAS) based on phase-sensitive photosensitive time-domain reflection has obvious advantages such as long detection distance, high sensitivity, high spatial resolution, low cost, and passive and anti-electromagnetic interference.Because of these characteristics, DAS is suitable for seismic exploration and pipeline inspection in the petroleum industry.In this paper, the principle and demodulation mechanisms of optical fiber DAS technology are introduced.Recent progress of research on optical fiber DAS is reviewed, emphasizing signal-to-noise ratio enhancement, detection range expansion, and sampling rate improvement.In addition, the commercialization of optical fiber DAS both at home and abroad are summarized, and the performance and features of DAS products in different companies and research institutions are analyzed and compared.Application cases of optical fiber DAS in VSP logging, microseismic detection, and pipeline monitoring are also discussed, arguing on their strong market competitiveness.Finally, directions of future development are discussed, making a case for the need of ultra-fidelity optical fiber DAS and multicomponent detection fiber DAS.