Two 3rd-order sequences can be divided in the Lower Triassic Jialingjiang Formation (T1 ) in the eastern part of Sichuan Basin, which correspond to two geologic chrons, Jialingjiang 1 to 2 Members (T1j1-2) and 3 to 5 Members(T1j3-5). Based on the comprehensive study of rock cores and loggings, six 4th-order and fourteen 5th-order sequences are further recognized and both of 3rd-order sequences are attributed to TST and HST. The sedimentary facies went through a transition from open platform to restricted platform so that Jiangling Formation includes the two sedimentary facies, the open platform facies and the half-restricted to restricted platform facies, from which six subfacies and twenty microfacies can be recognized. The 4th-order and 5th-order sequences are comparative in wide region of platform but the bank has not significant migration in vertical. Bank facies developed in the platform during T121 and T141 chrons which were just in a special stage of eustracy cycles. Limestone of the open platform facies is transformed into gyprock and dolostone of the restricted platform facies during T1j1-2 and T1j3-5, which constitute two sedimentary cycles.