Abstract: Based on the engineering of Zhangjiawan iron mine，the key technologies in integration of underground mining and beneficiation are analyzed and studied，including mining method，beneficiation process，overall layout，development and transportation.Then this integrated technical scheme is optimized to realize the integration of underground mining and beneficiation，waste-free emission，and environment-friendly protection.The primary design on the integration of underground mining and beneficiation for Zhangjiawan iron mine is finished.The beneficiating plant at underground is near by the stope and arranged at the stable surrounding rock in the primary design，where tailings are discharged into the near goaf，so the production cost is lower.The primary design can be used as basis for the construction unit to carry out the next phase of the design and constructing，and also can be used as a reference for similar mine construction.

Key words: Integration of underground mining and beneficiation, Key technology, Design practice, Mining method, Beneficiation process