Abstract: The paper discusses the faults systems, types of the structural traps, distrifutions of the strata and their relationships, kinds of the sandy bodies as well as the basementrocks within the half-graben systems in Eastern China. And it further discusses the petroleum geology and the types of the oil-deposits of the Deep-subsidence zones within tertiary half-groben systems. In the paper, Author states that the zones are favourable areas for hydrocarbon generation and accumulation and that the types of oildeposits, degrees of hydrocarbon accumulation and their distributions are related to the kinds of the depressions and the positions of the reginal structures and the geologeical levels.