The theories of tidal analysis and methods of ocean tide modeling are presented at first,and a series of global ocean tide models (FES,CSR,GOT,NAO,TPXO,EOT,DTU,HAMTIDE and OSU) are summarized, including their affiliations, data, and methods of modeling. The amplitude differences of M2 constituent of four new models (FES2012,EOT11a,DTU10,HAMTIDE11a) which released after 2010 are provided to show that shallow-water and polar sea are the main different regions. The main reasons leading to a poor accuracy in polar sea tidal modeling are the lack of highly accurate altimetry data and the presence of sea ices. Some suggestions are proposed for the future study of ocean tide modeling.