Abstract: This paper presents a unified software/hardware mult-i thread programming model supporting dynamic reconfiguration （SHU MDR） and its hierarchical structure for data stream driven applications in reconfigurable systems．Through hardware thread interface design and operating system kernel extension, athis model makes it easy for designers to implement software/hardware partition from the unified thread view．The experimental results on data encryption/decryption application show that both the time overhead and resource utilization of unified thread abstraction are at low level． Moreover, aSHU MDR could exploit programmable flexibility while effectively maintaining hardware task's performance．