The investigation on hydrocarbon-expulsion from source rocks has made big advances in the following aspects: the mechanism and key factors on hydrocarbon expulsion, the research on the oil derived from coals and its exploration break, episodic hydrocarbon-expulsion, and establishment of compaction-fracturing model of hydrocarbon-expulsion. On the basis of current situation on the investigation, the paper brings forward several suggestions and prospects of the research: strengthen the high resolution research on the characteristics of the hydrocarbon-expulsion in the section of source rocks, set up the hydrocarbon-expulsion model including three phases(compaction, uncompaction and cracking), evaluate hydrocarbon-expulsion on classification of the anisotropic source rocks, and discuss the relation between hydrocarbon-expulsion and hydrocarbon accumulation. 