中文摘要：

针对高斯平均引数法、白塞尔方法和嵌套系数法三种不同大地主题反解的数学模型，顾及到大地主题解算时可能出现的各种不同的特殊情况，指出相应算法存在的缺陷，提出相应的改进计算方法，并通过算例对改进后的算法进行验证。

英文摘要：

On the lattitud method, three different algorithms of Bessel method and Nested corresponding algorithms and present improved solution,of geodetic problem, which are verified the reverse solution of geodetic problem for Gauss mid- coefficient method, it points out the defects of the calculating metheods considering various special cases on through some examples.