Abstract: With rapid development of the GNSS technology and the global application of GNSS, there will be a series of civil liability imposed on the GNSS service providers, including contract liability and tort liability. In accordance with the American law and judicial practice, the plaintiff could file a lawsuit again the GPS service provider in U.S.A. And from the perspective of American court, there will be a tendency to use the product liability resolving the disputes caused by GPS malfunction and defective signals. Through the analysis on the American law and practice, the author is focusing on develop the characterized Chinese liability systems to cope with GNSS malfunction and defective signals.