The book Baharestan by Hajji shekh Mohammad Hussein Ayati was written about the outstanding religious, scientific, cultural and political characters of the Ghohistan region from the past to author’s present time. In this article, Baharestan has been evaluated from descriptive-analytic method on the base of the pivots of criticism and inspections of books (external and internal criticism). Despite the author›s enormous efforts to write a well reasoned out work, about characters and events of Ghohistan, spending lots of time, and in spite of using numerous resources; this book also has some errors and with a critical viewpoint, we can make the best use of it. Author hasn’t made the optimum use of all important geographic sources and he also has ascribed some characters to Ghohistan by mistake and in some cases without any reasonable bases, he has inserted some lengthy quotations from recent sources. Also regarding the conquest of Ghohestan, no use was seen in book relating to some authentic sources and has exaggerated in describing the biography of some of Ghohestan’s outstanding characters. The cited sepulchers in this book have been mostly based on seen generosities of them, and have not been evaluated and noticed by the author from the virtue of the important precedin sources. The matters of fourth section of this book are mentioned in detail, but in precise wording and precious value which indeed has lots of value and the author by composing of this book has preserved some of the luminous figures and permanent individuals of Southern Khorasan