In order to understand anchor’s working state of pile and anchor support system in deep foundation pit, the axial force of pre-stressed anchor cable was monitored in the whole process of deep foundation pit excavating and backfilling in Shijiazhuang City. Some conclusions were got by analyzing monitoring results. It was proved that a big difference exists between oil pressure gauge reading of jack and practical axial force of anchor because of the mismatch of stretching equipment and anchorage. Axial force of former anchor was decreased due to latter anchor tension with little effect and axial force of anchor was decreased slightly when deep foundation pit was backfilled. It was monitored that the measured values had 17.9% to 50.7% of designed values.