Abstract: Having made a great number of study on theforming conditions of diatoms in the principaldiatomite-produing areas, the authers foundthat the thickness of diatomite is related to thefrequenry of palaeo-structure activy。In an areawith stable structures, diatomile deposjis arethick. Generally，diatom planis enteaded waste-ly and abundant reserves exists, where the hasin and water area were large. The generaand species,quanlify test complefeness multi-plying speed oi dialom anc ihe varieties andquantity of inorganic subtance are related tothe environments iepositional conlitions,hydrochemicai features of waler body, palaeoclamit and other factors, From the study, thepaper deduced the field methods and labora-tory-research emphasisfor the diatomiteresources vealuation.