The first dig ceremony for the construction of the fort was held on Thrusday, Phalgun Vali 19, V.S. 1645 i.e. 30th January, 1589 AD. The Foundation was laid on Monday, Phalgun Sudi 12, V.S. 1645 i.e. 17th February, 1589 AD and it was completed on Thrusday MAgh Sudi 6 V.S. 1650 i.e. 1645 17th January 1594 AD. Later on this fort became the most magnificent example of architecture and great temple of art. The present fort is a composite structure, the result of intense building activities of many rules through four centuries and one of the precious gems of Indian architecture in the midst of Thar Desert.
Raja Rai Singhji's fortifications of this fort followed of this fort followed, the type adopted in Turkish forts with walls slanting inwards, the bastions here are not as big but also not reduced to merely ornaments. The palaces in this fort have a view over the town, a typical characteristic adopted form Mughal palaces at Agra, Delhi and Lahore which overlook a beautiful river side. this fort is in the form of a quadrangle, with perimeter of 1078 yards and possesses 37 bastions, on an average 40 feet high surrounded by a strong curtain wall, which is encircled by a deep moat 30 feet wide and 20 to 25 feet deep. It has two entrances, KARAN PAROL on the east protected by four gates and CHAND PAROL on the west protected by one gate DHRUV PAROL. CHAND PAROL and DHARUV PAROL are not in use presently.