As the new generation information technology and manufacturing industry get integtated, location based service (LBS) is of significant importance to solve the problems incurred by the digitalization and networking in the production process. Being the fundamental technology of LBS, indoor localization plays an indispensable role in realizing intelligent manufacture. However, when conventional indoor localization system is applied in complex, dynamic and unstructured industry environments, its performance is seriously degraded. There are still many challenges in framework design,location estimation, data transmission and information processing. Thus, it is urgent to carry out the in-depth study of a complete technical system, which is an important direction for complex industrial environment. To meet the demands of industrial scenarios, some key problems such as system framework, localization model, network,data processing are studied. An indoor localization system for complex industrial environments is proposed in this dissertation.