The purpose of this study is an attempt to explore the basic concept of almost d istri butivernlatt ice with 0, Generali zed almost d istributive lattice and pscudo·complemcntation onrnalmost di stribut ive Ian ice with 0 and conceptual ditTerence between lattice, almostrndi stributi ve lattice with 0 , generalized almost d istributive lattice and pseudocomplementationrnon almost distributi ve lattice with a arc described. Basic definition.rnexample lemmas and theorems arc given. And it is proved that the pseudocomplementation'"rnon almost distributive lattice with 0 is equationally defined.