The present invention concerns a method and system for recording a monitoring log for use in a magnetic resonant imaging system, wherein a log document is crated and is shared in an external storage device, timed queries are made to monitoring points on a monitored target by a timer and the data collected are periodically reported to a control module; and wherein the control module formats the reported data into a record format and writes the record formed into the shared log document. When the log document is not accessible, a buffer queue is opened automatically in an internal storage device to buffer the reported data, and when the access returns to normal, the records and the recorded data in the buffer queue are written as a supplement into the log document.