Based on the time calibrating technology with GPS and the actual situation of the CINRAD radar at Jinan, combining software with hardware, the automatic timecalibrating system with GPS for CINRAD data processing system without Internet connection was developed. With the system, the rectification rate reaches 100% within the calibrating time interval, and the time precision of the system reaches the second level, which completely satisfy the related requirements. This system has many advantages: real time, on line, automatic time calibration, safe, reliable, convenient to supervise, etc. and can take place of the manual approach and improve the radar data quality.