The design and implementation of data transfer card based on PCI express bus （Abbreviated for PCIE bellow） is introduced. It is used in real-time data recording system of SAR echo. The system uses common PC computer based on PCIE bus structure as development platform. Receiving echo data in real time is the key technology of system implementation. The PCIE card transfers SAR echo data to the shared buffer in the PC＇ s memory. The results indicated that the PCIE transfer card works stably and real-time data recording system of SAR echo data transfers speed can reach 60MB/s steadily. It guarantees continuous data receiving and data＇ s integrality.