中文摘要：

通过编程对IGS精密星历和钟差的Lagrange插值、Neville插值、线性插值、多项式拟合算法等进行分析。结果表明：对于精密星历，插值算法的精度较相同阶次的拟合算法差，在拟合与插值时，选择最佳的阶数，其精度可达到毫米级；对于钟差，采用线性插值算法更为简单有效。

英文摘要：

This article analyzed the IGS precise ephemeris and clock error by Lagrange interpolation, Nevilleinterpolation, linear interpolation and polynomial fitting method . The results showed that: for the precise ephemeris,the same order of accuracy of fitting method was better than the interpolation algorithm; when the best order of theinterpolation and fitting algorithms were chosen , the precision could reach millimeter; the linear interpolation algorithmwas more simple and effective in clock error.