The optics wavefront processor system (OWPS) described in this paper is one of the key processors in 1.2m telescope adaptive optics system (AOS). It is a highperformace system with high throughput rate and short delay. In order to meet the high speed requirement，the demanded real-time and concurrency in the main computation is first analyzed，then a decorrelation procedure for wavefront processing is proposed. Based on the several subtasks in wavefront computation，data acquisition，slope computation and wavefront reconstruction are conducted in pipeline. The delay is reduced greatly by the utilization of image aquisition time and the foundation of pepeline.