Lawsonite eclogites are typical low-t and high-p metamorphic rocks formed during cold oceanic subduction. Lawsonite is an important carrier that brings water into deep mantle and hence plays a crucial role in fluid behavior of deep subducted slab, thus attracting widespread attention. This paper provides an overview of the progress in petrologic study of lawsonite and lawsonite-bearing eclogites in the past two decades: ① the distribution of lawsonite eclogites worldwide; ② the classification of lawsonite eclogites and modes of occurrence of lawsonite; ③ experimental studies and thermodynamic modelling upon the stability of lawsonite eclogites; ④ the formation and preservation of lawsonite eclogites; ⑤ fluid behavior in lawsonite eclogites. The above aspects, especially the last one, are long hotspots in the study of the subduction zone. Both prograde and retrograde veins commonly occur in blueschists and eclogites from Southwestern Tianshan. Further research on these veins will provide important constraints on fluid behavior during deep oceanic subduction.