Based　on　discussing　each　unit　of　the　lithostratigraphic　rock　composition,　fossil　assemblages　and　depositional　environment　from　Mesozoic　to　Cenozoic　in　Wulaga　fault-depression,　Jiayin　County,　Heilongjiang　Province,　and　comparison　with　other　basins　in　SunwuJiayin　and　Songliao　basin,　the　authors　divided　the　Mesozoic　and　Cenozoic　strata　into　three　tectonic　layers　and　five　lithostratigraphic　units,　and　discussed　their　distribution　and　evolution,　and　made　the　regional　geological　map.　The　Wulaga　basin　shows　three　significantly　different　basin　evolution　stages,　during　which　the　two　distinct　unconformities　are　recognised,　namely:　the　unconformity　between　upper　Cretaceous　and　Lower　Cretaceous　and　between　the　Upper　Cretaceous　and　Neogene,　thus　made　three　different　types　of　basin　evolution　stages　in　Wulaga　from　Mesozoic　to　Cenozoic;　they　are　Early　Cretaceous　rift　basin　evolution　stage,　the　Late　Cretaceous　large　scale　inland　depression,　and　Neogene　inland　basin　evolution　stages.