The "Huacheng Night" of the 2018 China Overseas Talent Exchange Conference and the 20th Guangzhou Science and Technology Exchange Conference of Chinese Overseas Students (hereinafter referred to as the "2018 Shanghai Fair") was staged in the Oriental Hall of Guangzhou Baiyun International Conference Center. Beilarly professional audio powers the night of the Flower City --- 2018 Shanghai International Trade Fair evening performance, Beilarly professional audio engineer has developed a sound solution for the concert venue and sound field characteristics, and the on-site sound reinforcement system uses a single 12-inch line Array, with back listening speakers. The sound field of the whole performance venue is not only evenly covered, but also the sound quality is clear, making the middle frequency round and full, the high frequency is delicate, and the low frequency diving is full of flexibility.