Abstract: With the development of location-based service, people’s demand for the accuracy of smartphone positioning is increasing rapidly. At present, the smartphones positioning mainly relies on the chip solution provided by the Global Navigation Satellite System (GNSS) modules, whose accuracy is only at metre level. In 2016, Google announced to open the right to access to GNSS observation data, which supports the study of smartphone positioning algorithms. In order to explore the positioning accuracy and reliability of multi-frequency RTK with GNSS module for smartphones, the paper conducts experiments under static and dynamic conditions using Huawei P40 cellphone respectively. The results show that the real-time kinematic (RTK) positioning accuracy of the smartphone multiple-frequency multi-system is better than the chip solution in the static environment, with the root mean square (RMS) of positioning error in the east (E), north (N) and high (U) directions being 0.20 m, 0.39 m and 0.31 m, respectively, which is 57%, 71% and 75% better than the chip solution. The localization accuracy in dynamic environment can still reach the decimeter level, which is 37.84%, 47.22%, and 53.68% better than the chip solution in the three directions of east, north, and high respettlvely.