As the digital wave sweeps across the world, network communication technology is changing with each passing day. The speed and stability of data transmission have become the focus of attention for enterprises and data centers. In the actual network construction and upgrade process, it is often necessary to convert 100G QSFP28 to 25G SFP28 to meet the diverse needs of different network architectures. So, how can this conversion be achieved efficiently and reliably? This article will introduce several connection methods from QSFP28 to SFP28.