The present work, the comparative study of all Sanskrit Grammars to scholars. Grammar composition is a very delicate and difficult task in the sense that it is both a science as well as an art. It is science in the sense that it should be objective, formal and at the same time comprehensive of all the linguistic data. Also it is an art in sense that the skill of framing grammatical rules depends upon the individual grammarian. We can see that the linguistic activity in India, which started from pre-Vedic times and was carried on by the post-Vedic grammarians and linguistics like Panini was further carried on even after Panini?s times in spite of the fact that Panini?s grammar was a master-piece in grammar composition and threw back all the pre Paninian grammars into total oblivion. Thus, the whole subject of the copa-rative study of all Sanskrit grammars with special reference to past passive participles is treated on modern linguistic and not only on pure traditional grammatical leve. This linguistic approach has given out certain interesting and important conclusions. In the present work, the study and comparison in mainly centred round the problem of finding out and comparing the grammatical principles of language-description and the techniques employed by the grammarians to arrive at the formations available in usages.