The traditional single specular reflection model enables to formulate the basic features of the multipath error, but this model fails to characterize the combined effect of multiple reflection signal in realistic environment finely. In view of LOS, this paper proposes a new multipath analysis model based on PLLB, deduces an estimating method of multipath error, and researches correlation of pseudorange multipath error between the epochs and random noise characteristic of dynamic carrier phase multipath error. The results of experiment test show that the pseudorange multipath has the correlation between the epochs, the paper utilizes this correlation between the epochs for correcting the pseudorange multipath error to make the double difference pseudorange error decrease by 52.7％, and due to the random noise characteristic, the dynamic carrier phase error will increase.