Abstract: In recent years, high precision positioning of low-cost miniaturized GNSS receiver has been a hot topic on account of the big surge of high precision positioning in mass market. In this paper, we analyse the quality of GNSS observations and evaluate the positioning performance of a new low-cost, single frequency, multi-GNSS receiver μ-blox M8P in different scenarios with different processing strategies, providing reference for high precision positioning of low-cost GNSS receiver. The experimental results show that the carrier to noise ratio of GNSS observations of μ-blox is lower than that of geodetic receiver and the pseudorange and carrier phase noise are higher. In static mode the low-cost GNSS receiver can achieve a high performance with a precision of centimeter level from short baseline relative positioning. In dynamic urban vehicle test the low-cost GNSS receiver can provide a precision of sub-meter to meter level with short baseline relative positioning. In a signal-constrained environment, the GPS／GLONASS combined positioning can provide more stable results.