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Nanhu--Sangjiawopu Fault is a buried active fault striking in northwest and crossing Changchun City�� It is very important to the crust stability of Changchun district�� Based on the data of high-resolution remote sensing information interpretation��ground penetrating radar probing��shallow seismic investigation and exploration of composite drilling section and the data of ESR dating for Quaternary deposits��we discuss the spacial distribution and active characteristics of Nanhu--Sangjiawopu Fault�� Nanhu-Sangjiawopu Fault is with a straight fault trace extends along Lujiawopu��Housanjiazi��Nanhu park��Changchun park��Sangjiawopu and Dahelong�� Its occurrence is 45° ∠65°�� At Dahelong village in the northwest segment of the fault��it displaced the strata of Upper Cretaceous Nenjiang Formation leaving a eroded gully along the fault trace at the top of the Nenjiang Formation but displaced the strata of Early and Middle Pleistocene�� Near Lujiawopu in the southeast segment of the fault��it displaced the strata of Cretaceous Quantou Formation but displaced the strata of Middle and Late Pleistocene�� Nanhu-Sangjiawopu Fault was formed in the end of Mesozoic and became active as a left-lateral slip fault in Early Quaternary�� It has not acted since Middle Pleistocene��