Squaraine　dyes,　as　an　important　kind　of　cyanine　dyes,　attracted　more　and　more　attention　in　organic　solar　cells　due　to　its　strong　absorption　and　emission　characters　in　the　visible　and　near　infrared　region　and　good　opto-thermostability.　With　the　continuous　progress　for　the　theory　and　the　improvement　for　the　manufacture　technology　of　the　solar　sells,　squaraine　dyes　will　make　rapid　progress　in　this　field.　Therefore,　the　application　of　squaraine　dyes　in　the　dye-sensitized　solar　cells,　as　well　as　in　the　bulk-heterojunction　organic　solar　cells,　in　recent　years　has　been　reviewed.　Furthermore,　in　the　view　of　the　mechanism　the　effects　of　the　molecular　structure　of　the　dyes　to　the　performance　of　the　solar　cells　are　discussed　intensively　and　the　research　directions　in　the　near　future　are　also　expected.