The present disclosure provides a navigation system that includes an electronic device and a cloud server. The electronic device is configured to capture an environmental image, and to transmit the environmental image and a target information. The cloud server is configured to store several default patterns, and each of the default patterns corresponds to a default coordinate. The cloud server analyzes a pattern image of the environmental image according to the default patterns to calculate a coordinate of the electronic device, so as to execute navigation according to the coordinate of the electronic device and the target information.