This thesis analyzed various error resources in gps surveying and advanced appropriate correction measures ; it introduced theory and method that estimate parameter in reliability study , and then , deduced adjustment mathematic model of gps network ; based on analyzing characteristics of reliability study of gps network and outlier analysis , it carried profoundly out study on issue about reliability of gps network , deduced and summarized target of reliability of gps network , including redundant observation component of gps baseline vector and inside & outside reliability index , advanced a theory about reliability of gps network based on correlative analysis , and summarized methods that improve reliability of gps network ; it worked out a software of reliability analysis about gps observation , which made reliability analysis automatic and convenient 論文分析了gps測量中的各種誤差來源,提出了相應的改正措施;介紹了可靠性研究中參數估計的理論和方法,進而推導出gps網平差的數學模型;在分析了gps網可靠性研究和粗差分析特點的基礎上,對gps控制網可靠性問題進行了深入的研究,推導總結出了gps網可靠性指標,包括gps基線向量的多余觀測分量、內部可靠性和外部可靠性指標,提出了基于相關分析的gps控制網可靠性理論,總結出了提高gps控制網可靠性的措施;編制出了gps觀測數據可靠性分析軟件,使可靠性分析自動方便。