Abstract: Marine controlled source electromagnetic (MCSEM) is a new geophysical method for detecting submarine oil and gas resources. Owing to the specific offshore working conditions, monitoring deck temperature, humidity and relevant parameters of ship equipment becomes extremely significant for safety and effective production. Based on the study of MCSEM production and deck work mode, this paper studied and designed a set of method for developing the deck monitoring system for MCSEM work. Based on.Net Framework class library, this paper designed and accomplished the monitoring software of marine controlled source electromagnetic (MCSEM) transmitting system using C#C and C++ language. The network architecture, data storage and user interface were designed, and the Socket network programming technology, multi-threading technology, ADO. Net database technology and display technology, which combines GDI + with OSG, were integrated. The system test results show that the software has good performance and can be applied to MCSEM.