This paper briefly introduces equipment of No.1 RH in Bengang steel-making works, working principle of steam ejector. With reference to actual working situtation on site, describing the factors of Abstract: this paper briefly introduces equipment of  No.1 RH in Bengang steel-making works, working principle of steam ejector. With reference to actual working situation on site, describing the factors of influencing steam ejector capacity, failures easily happened during operation and troubleshooting measures. According to practical experiences and RH system working situation of many years, the paper provides data table of RH vacuum pump and cooling data table of condenser, the failure happened in site and resolving solution.