ArcMap How to convert a coordinate system into a projection coordinate system

1, open the existing map, and open the Toolbox, as shown in the following picture:

2. Follow the arrow points, expand the node in sequence, and select the Project tool, as shown in the following illustration:

3, in the Open Project window, select the output of the space coordinate system, and then click "Select", as shown in the following figure:

4, select "Projected coordinate System", as shown in the following figure:

5, select "World", click "Add", as shown in the following figure:

6, find WGS 1984 Web mercator.prj, click "Add", as shown in the following figure:

7, in the Drop-down box, select the only one, and then click "OK", which has been completed (note here: Please remember the position in the output Dataset or Feature class, which is the converted output SHP position), as shown in the following illustration:

8. Close the ArcMap, reopen the ArcMap, and add the layer shp file that was converted in the previous step of data, which is already the Mercator coordinate system, as shown in the following illustration: