CAD存成dxf之后拖入qgis，然后设置好坐标，位置正确了。但文字在qgis里不显示，请看3.1节。
再用qgis的bulk vector export插件导出geojson格式，选择layer CRS

{
    "type": "FeatureCollection",
    "name": "番禺 — entities",
    "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::4526" } },
    "features": [
        { "type": "Feature", "properties": { "Layer": "标注", "PaperSpace": null, "SubClasses": "AcDbEntity:AcDbText:AcDbText", "Linetype": null, "EntityHandle": "29C", "Text": "LG10#工作井工区用地边线" }, "geometry": { "type": "Point", "coordinates": [ 38428721.99546130746603, 2528820.591111802030355, -2.375261420233354 ] } }
    ]
}

或者
导出geojson文件：鼠标右键点击文字图层——导出——要素另存为
注意，cad中的线和文字同在时，拖入qgis，会对应不同的层。

导出的文件：

{
    "type": "FeatureCollection",
    "name": "11",
    "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::4526" } },
    "features": [
        { "type": "Feature", "properties": { "Layer": "标注", "PaperSpace": null, "SubClasses": "AcDbEntity:AcDbText:AcDbText", "Linetype": null, "EntityHandle": "29C", "Text": "LG10#工作井工区用地边线" }, "geometry": { "type": "Point", "coordinates": [ 38428721.99546130746603, 2528820.591111802030355, -2.375261420233354 ] } }
    ]
}

mapus中的文字如何导入cad，请看3.1节。