先上ports.conf及相关文件：

ports.conf

# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default.conf

NameVirtualHost *:80
Listen 80

NameVirtualHost *:81
Listen 81

<IfModule ssl_module>
	Listen 443
</IfModule>

<IfModule mod_gnutls.c>
	Listen 443
</IfModule>



# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

Django项目一sites-available/conf文件：

<VirtualHost *:80>
	ServerName xxx
	ServerAdmin xxx
	WSGIScriptAlias / /var/www/xxx/xxx/wsgi.py
    Alias /media/ /var/www/xxx/media/
    Alias /static/ /var/www/xxx/static/
	<Directory /var/www/xxx/media>
		Require all granted
	</Directory>

    <Directory /var/www/xxx>
		Require all granted
	</Directory>

	<Directory /var/www/xxx/static>
		Require all granted
	</Directory>
 
 	<Directory /var/www/xxx/xxx>
		<Files wsgi.py>
			Require all granted
		</Files>
	</Directory>
	
	ErrorLog ${APACHE_LOG_DIR}/error.log 
	CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Django项目二sites-available/conf文件：

<VirtualHost *:81>
	ServerName xxx
	ServerAdmin xxx
	WSGIScriptAlias / /var/www/QXTechnology/QXTechnology/wsgi.py
	Alias /media/ /var/www/QXTechnology/media/
	Alias /static/ /var/www/QXTechnology/static/
	
	<Directory /var/www/QXTechnology/media>
		Require all granted
	</Directory>

    <Directory /var/www/QXTechnology>
		Require all granted
	</Directory>

	<Directory /var/www/QXTechnology/static>
		Require all granted
	</Directory>
 
 	<Directory /var/www/QXTechnology/QXTechnology>
		<Files wsgi.py>
			Require all granted
		</Files>
	</Directory>
	
	ErrorLog ${APACHE_LOG_DIR}/error.log 
	CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

出现的现象是：打开网站一，则再打开网站二出现崩溃；先打开网站二，则反之。
最后发现问题出在wsgi.py文件。
其中一个wsgi.py文件我只设置了os.environ.setdefault(‘DJANGO_SETTINGS_MODULE’, ‘xxx.settings’)，而漏了os.environ[‘DJANGO_SETTINGS_MODULE’] = ‘xxx.settings’。
最后两个文件都设置了即解决了问题。