A　series　of　rare　earth　compound　oxides　with　the　formula　of　La0.8Sr0.2Mn1-xCoxO3(x　=　0.0,　0.3,　0.5,　1.0)　were　prepared　by　the　method　of　citric　acid.　Structures,　figures　and　magnetic　properties　of　the　samples　were　analyzed　by　means　of　XRD,　SEM　and　SQUID.　Experiment　results　prove　that　all　the　samples　are　hexagonal　I　but　their　figures　and　magnetic　properties　are　different.　La0.8Sr0.2MnO3　is　ferromagnetic.　La0.8Sr0.2Mn0.7Co0.3O3　and　La0.8Sr0.2Mn0.5Co0.5O3　are　ferrimagnetic.　La0.8Sr0.2CoO3　is　antiferromagnetic.　SEM　results　indicate　that　the　structure　of　the　first　three　are　three-dimensional　reticulations　which　are　made　up　of　some　small　ellipsoids　which　link　up　at　the　head　and　the　end.　The　fourth　sample　looks　like　some　dispersed　small　balls.