RNCLG is a 3G simulator used for testing UMTS RNC. With RNC version updating more frequently, the originally RNCLG pattern can't fulfill all new requirements and challenges RNC testing brings. The paper propose an improved RNCLG pattern, mainly added a GUI component which integrated into whole RNCLG. The GUI has the functionality of automated files configuration, remote control of RNC testing, and shows more statistic and KPI on pages. The pattern had been successfully implemented and proved to be effective and effect for RNC testing. At the last part of the paper, we discuss the proposed enhancements to the tool, and give the evidence that the pattern can also be use as a reference for other related tools.