A server assembly includes a first server and a first airflow guiding pipe. The first server comprises a front wall. An input hole is defined in the front wall. A first input opening and a first output opening are defined in the first airflow duct. The first output opening corresponds to the input hole so as to guide airflow into the inner of the first server to dissipate heat generated by the first server. The first airflow guiding pipe is connected to the first input opening of the first airflow duct, the first airflow guiding pipe is configured to receive and guide airflow into the first airflow duct.