Abstract: As the point positioning accuracy of single frequency low-cost GPS receivers is slightly low,we propose to use amendments provided by single base station to correct observed data of single frequency of mobile station.Meanwhile,ionospheric parameters are introduced to estimate ionospheric delay on time and do precise point positioning calculations of single frequency.By analyzing the numerical example with real data,the new method in this essay markedly improves the converging speed and positioning accuracy of single-PPP.The accuracy is better than 2 cm and less influenced by the distance between base stations.