how to fix "your computer is on low memory or low resource memory " in solidwork

Simple, just do what is being asked add more memory. With the CAD programs of today 8 GB absolute minimum memory. For a machine for that works in a production environment 16 GB or more as much your machine will take

Try decreasing the image quality in document properties in solidworks. And see that you close unnecessary background application that are using system memory from the task manager.

thanks satya its work

sadly this is a know issue and SolidWorks sometimes has a hard time releasing resources. The only option in longer use cases is to restart SolidWorks.