Copy these two files from some existing pydev eclipse project to root folder of new project which you want to import in eclipse.
.project
.pydevproject
Open .project file in notepad and change name to your_project_name.
If you don't have these files then you can create them yourself.
Open notepad, copy following text, click File -> Save As... -> Enter ".project" in File name: -> Select All Files from Save as type: drop down list.
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>your_project_name</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.python.pydev.PyDevBuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.python.pydev.django.djangoNature</nature>
<nature>org.python.pydev.pythonNature</nature>
</natures>
</projectDescription>
Now again open notepad, copy following text, click File -> Save As... -> Enter ".pydevproject" in File name: -> Select All Files from Save as type: drop down list.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<?eclipse-pydev version="1.0"?><pydev_project>
<pydev_variables_property name="org.python.pydev.PROJECT_VARIABLE_SUBSTITUTION">
<key>DJANGO_MANAGE_LOCATION</key>
<value>manage.py</value>
</pydev_variables_property>
<pydev_pathproperty name="org.python.pydev.PROJECT_SOURCE_PATH">
<path>/${PROJECT_DIR_NAME}</path>
</pydev_pathproperty>
<pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 3.0</pydev_property>
<pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">Default</pydev_property>
</pydev_project>
Open eclipse, click File -> Import. New window will open. Now select 'Existing Projects into Workspace' under 'General' and click Next. On new window browse to project root directory and select root folder. Then click finish.