在对MgB2超导体成相物理化学过程分析基础上,用原位粉末套管(PIT)技术制备了MgB2/Fe超导线材,采用扫描电子显微镜(SEM)研究了线材中MgB2超导相的微观结构,使用标准四引线法测量了线材的传输临界电流密度(Jc),结果表明:线材中MgB2的晶粒尺寸为1～3μm,晶粒间的连接较好,线材在20 K,自场下,Jc值达到6.1×04A/cm2。 MgB2 / Fe superconducting wire was prepared by in-situ powder tube (PIT) technology based on the phase-by-phase physicochemical analysis of MgB2 superconductors. The microstructure of MgB2 superconducting wire in the wire was investigated by scanning electron microscopy (SEM) , The critical current density (Jc) of the wire was measured by the standard four-lead method. The results show that the grain size of MgB2 in the wire is 1 ~ 3μm and the connection between the grains is good. When the wire is at 20 K, Jc value reached 6.1 × 04A / cm2.