Precise Point Positioning (PPP) has obvious advantages compared with differential technology. It can perform external correction by means of prior data from the International GNSS Service (IGS) website, enabling precise measurement of the position of Global Navigation Satellite System (GNSS) rovers. However, achieving fast static centimeter-level positioning with PPP is quite challenging, requiring the use of various methods to correct numerous error sources such as ionospheric delay, tropospheric delay, satellite orbit and clock errors, code phase biases, antenna phase center effects, phase wrapping, and station displacement effects, so as to improve positioning accuracy and shorten the convergence time. Various error sources of PPP are deeply analyzed and the PPP models are explored used to correct these errors as well as the sources of correction data.