The data processing and operation monitoring subsystem of DCS (Data Collection System) mainly focuses on the unpacking and data checking of packaged datagram and DCP (Data Collection Platform) information through the highspeed network with CDAS (Commander Data Acquired System). The system can generate realtime DCP messages and classified DCPstatus information, realizing DCP operating status monitoring, and meanwhile input all categories of data into the database, thereby to provide DCP users with relevant data for the distributing and broadcasting of DCP datagram. This system is developed by means of software engineering with a modularized structure. Through the more than a half year trial operation and continual betterment, it is proved stable and reliable.