Based on dissolve-precipitate thermodynamic principle, CaMg(CO3)2 is supersaturated in present-day seawater. Previous studies have shown that dolomite can not be directly precipitated from seawater under standard experimental conditions (25℃, 1 atm) so that it is suggested that dolomite formation should not only be related to thermodynamic factor but also kinetic factor. The authors studied thermodynamic and kinetic principles in dolostone genesis and discussed the possible factors overcoming the kinetic barrier during the dolomitizition process. Because of the complicated genesis of dolostone, we can not apply the sedimentary facies to study dolostone. The "Sedimentary diagenesis facies" were firstly inducted, which means the geological settings of sedimentary of diagenesis for dolostone. Integrating the international dolomitic models, we divided the sedimentary diagenesis facies into surface sedimentary facies and burial diagenesis facies, which are divided in detail and the possible lithologic and geochemical characteristics of dolostone for each facies were discussed.