Currently, integration application, such as EAI (Enterprise Application Integration), B2BI (Business-To-Business Integration), requires reliable B2B integration framework that can stably process massive I/O transactions during overload state. This paper proposes the delay time-based peak load control for stable performance and we describe that how the suggested pattern is applied to B2BI as an example. The pattern uses the delay time algorithm for controlling the heavy peak load caused by many requests for a short period of time. According to our experimental result, the proposed delay time algorithm can stably process the heavy load after the saturation point and has an effect on the controlling the peak loads.