Objective To solve the problem that the timely salvation can not be provided to the critical sick when nurses are not in nurse station and can not hear the sound of buzzer. Methods By utilizing SCM and wireless numerical transmission module, the former sick area treatment station calling system was developed. The special information was coded through SCM. The dada were sent and received with wireless numerical transmission module. In this way, a portable calling information receiving machine was designed. Results The reliable receiving distance of receiving machine is in the bound of 800 meters, and it provides 16 channels to use for different floors, having data transmission check function, little power loss, performance steady and credibility. Conclusion With sickroom calling message receiving machine, the nurse on duty can receive the calling message of the sick at any time and in any room, so rapid treatment can be provided on time, improving the satisfaction degree of sick. Besides, the sound of the calling system in the sick area treatment station can be shut down at noon and night, thus providing better circumstance for the sick to rest. The design is suitable for the calling system in any type and makes up the original shortages of the calling system in hospital.