HTTP Adaptive Streaming (HAS) has become increasingly more popular. However, the research about HTTP adaptive streaming for multi-server environments is limited. Compared with traditional single-server environments, HAS for multi-server environments is able to offer expanded bandwidth, link diversity, and reliability. However, it is a challenging issue to support the seamless playback in multi-server environments due to their diversity of bandwidths. To solve this problem, we propose a partial segment based HAS scheme for multi-server environments. The proposed scheme provides seamless video streaming by adaptively controlling the size of the partial segment. The simulation results show that the proposed scheme adaptively transmits the multimedia content in multi-server environments.