In view of the problems of many operation steps, long grid-connection time and easy misoperatio in the manual grid-connection process of WHR in cement line, One-key grid-connected automatic control technology with SFC language was developed. The one-key grid-connected technology integrated signals such as the excitation system, the synchronization system, the steam turbine control system, and the circuit breaker status points into the DCS system， optimized the software and hardware configuration. Then added the new sequence control and logical judgments. Finally, one-key grid-connected was achieved with the SFC programming language. Practice shows that using the implementation of the One-key grid-connected technology, the operation was simple and reliable, the later periods was reduced, the grid connection operation time could be shortened from 3~5 minutes to 1~1.5 minutes, the grid connection success rate was high, and the misoperation rate was reduced.