Abstract
The monuments of Qajar and early Pahlavi periods in the valley of Darreh-Shahr of Ilam province are among the works that reflect the political and social developments of this era. The purpose of this study is to investigate the adaptive study of the spatial and temporal structure of Ghala Poursharf, Mirgholam Hashemi and Ghaleh Jahangirabad, the causes of their formation and pattern of distribution. The research method in this study was experimental research, field and library studies. In this regard, by studying the architectural elements each of the buildings, the Appellation of them according to their spatial-physical structure is to be re-evaluated. The results of the research are show that the construction of the studied buildings in the city of Darreh-Shahr, according based on military and security necessity and then on political and social grounds. The results of the research are show that the construction of the studied buildings in the city of Darreh-Shahr, have been according based on military and security necessity and then on political and social grounds. These buildings are located at the most appropriate geographical locations and related to agricultural affairs and tax affairs. On the other hand, according to architectural and archaeological studies, other buildings of Pourashraf fortress, has been built on the basis of military and security necessity, and the buildings of Mirgholam Hashemi and Jahangirabad have been manor house and where built at the beginning of the Pahlavi period for political and social reasons. So, in this study, these questions are raised: What is the pattern of distribution of these buildings in Darreh-Shahr? How are the spatial structure of these buildings? Can be used the title of fortress for these buildings?
Keywords: Darreh – Shahr, Late Qajar and Early Pahlavi, Fortresses, Comparative Study.

Introduction
From the location, the fortresses of Iran have been made in different ways in relation to the natural situation of the place and materials. So that, construction of fortresses in the Pre-Islamic Era and the Islamic period of Iran had a close connection with the political, economic and geographical necessities. For this reason, they have made the fortresses in the harsh mountains and beside the water and springs, around the cities and overlooking them. They have made these fortresses for their role in various political developments, such as the rise and fall of governments, the internal crises and used in the onslaught of foreign nations as a refuge for political opponents. Also build these fortresses have been important in the formation of cities. The shape, type, and number of Iranian fortresses towers in the Islamic period have been depend on the social, natural and military conditions of each region. The Iranian fortresses have a long, wide and long wall, cylindrical and multifaceted towers, one or more gates for entry and exit, and sometimes entrenchment on around fortresses. The type of relations governing the life of the fortresses was almost the same. These relations, along with the natural and geographical factors of the region, played a decisive role in function of the various parts of the fortresses, and they all brought together in a special type of architecture. In general, fortresses had several functions that including: for holding detainees, state treasury holdings and the status of government. With this introduction, the monuments from the Late Qajar and Early Pahlavi periods in the city of Darreh-Shahr called “fortress” have been selected for study. The main purpose of this research is to first introduce, describe and analyze the spatial structure of the buildings of Pourashraf, Mirgholam, and Jahangirabad, and then analyze their structure and location. The main purpose of this research is to first introduce, describe and analyze the spatial structure of the buildings of Pourashraf, Mirgholam, and Jahangirabad, and then analyze their structure and location.

Finding Research
The archaeological excavation in the Ziyat area is considered to be a collection of rescue researches of the ancient sites of the basin of the Kurih dam. In order to, this study has done identify and understand the status of the remains architecture and the ancient layers this site. Ziqi enclosure is one of the sites that was quickly destroyed by the first stages of dewatering in the dam buried lake, due to its location and texture; therefore, the implementation of ancient archaeological research on this site before the dam drainage of Amiri, It was essential and important to carry out these researches a valuable step in the process of recognizing and introducing this ancient work before its complete destruction. The Ziqi area has always been part of it due to its proximity to the Guria Monument. The first mention Piran in 1380 was identified during the first chapter of the Ancient Cognitive Examination of the Ivan County of Guria, which Zich was also part of it (Pirani, 2001: 159-183). In 2004, Ibrahim Moradi introduced the Ziqi site in an archaeological study of the Kyrgyz Dam basin independently of the “Guria” building (Moradi, 2004: 40-53). 

Conclusion
The archaeological excavation of the archaeological site of Zich has done in three parts distinct but related sections, including systematic survey, speculation to determine the area and extensive exploration of the site was accomplished. The results of these studies have ultimately led to the recognition of the temporary deployment area (seasonal settlement). The study of the architectural and architectural remnants of the spaces in the excavated workshops and their comparative comparisons with contemporary samples in the region has showed that the Ziqi area was a temporary deployment site (seasonal deployment) and a one-stage deployment that during a period (to Seasonal but for several years) has been used by the Cubans. Establishment in tents that surrounding it with single or double-edged stone and one or two row strips separated from each other, have been outside the tent space (outside the tent) cooking utensils and other day-to-day activities. The nomads have been set up stairs and set up tents on their slopes and have been facilitates their settlement. The healthy and complete example of such settlements that are related to the life of contemporary localities is to the present day and in the same style, and their works are clearly visible around the site.