First of all, the computer environment is Ubuntu 16.10, I use conda to manage the development environment !!!

uwsgi uses conda installpip installation

uwsgi ini file

# backend_uwsgi.ini file
[uwsgi]
# Django-related settings
# the base directory (full path)
chdir           = /home/yangtz/developproject/backend

# Django's wsgi file
# wsgi-file = /home/yangtz/developproject/backend/backend/wsgi.py
module          = backend.wsgi

 
# process-related settings
# master
master          = true
# maximum number of worker processes
processes       = 10
# the socket (use the full path to be safe
socket          = /home/yangtz/developproject/backend/backend/backend.sock
# ... with appropriate permissions - may be needed
chmod-socket    = 666
# clear environment on exit
vacuum          = true

# daemonize = /home/yangtz/developproject/backend/uwsgi.log

backend_nginx.conf

    # the upstream component nginx needs to connect to
    upstream django {
        server unix:/home/yangtz/developproject/backend/backend/backend.sock; # for a file socket
        # server 127.0.0.1:8000; # for a web port socket (we'll use this first)
    }
    # configuration of the server
    server {
        # the port your site will be served on
        listen      80;
        # the domain name it will serve for
        server_name 127.0.0.1; # substitute your machine's IP address or FQDN
        charset     utf-8;
    
        access_log      /home/yangtz/developproject/nginx_access.log;
        error_log       /home/yangtz/developproject/nginx_error.log;
    
        # max upload size
        client_max_body_size 75M;   # adjust to taste
    
        # Django media
        # location /media  {
        #     alias /path/to/your/mysite/media;  # your Django project's media files - amend as required
        # }
    
        location /static {
            alias /home/yangtz/developproject/backend/static; # your Django project's static files - amend as required
        }
    
        # Finally, send all non-media requests to the Django server.
        location / {
            uwsgi_pass  django;
            include     /etc/nginx/uwsgi_params; # the uwsgi_params file you installed
        }
    }

When sudo uwsgi --ini backend_uwsgi.ini is started, the result is

*** WARNING: you are running uWSGI as root !!! (use the --uid flag) *** 
chdir() to /home/yangtz/developproject/backend
your processes number limit is 63466
your memory page size is 4096 bytes
detected max file descriptor number: 1024
lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with --thunder-lock)
uwsgi socket 0 bound to UNIX address /home/yangtz/developproject/backend/backend/backend.sock fd 3
your server socket listen backlog is limited to 100 connections
your mercy for graceful operations on workers is 60 seconds
mapped 800448 bytes (781 KB) for 10 cores
*** Operational MODE: preforking ***
*** no app loaded. going in full dynamic mode ***
*** uWSGI is running in multiple interpreter mode ***
!!!!!!!!!!!!!! WARNING !!!!!!!!!!!!!!
no request plugin is loaded, you will not be able to manage requests.
you may need to install the package for your language of choice, or simply load it with --plugin.
!!!!!!!!!!! END OF WARNING !!!!!!!!!!
spawned uWSGI master process (pid: 9293)
spawned uWSGI worker 1 (pid: 9294, cores: 1)
spawned uWSGI worker 2 (pid: 9295, cores: 1)
spawned uWSGI worker 3 (pid: 9296, cores: 1)
spawned uWSGI worker 4 (pid: 9297, cores: 1)
spawned uWSGI worker 5 (pid: 9298, cores: 1)
spawned uWSGI worker 6 (pid: 9299, cores: 1)
spawned uWSGI worker 7 (pid: 9300, cores: 1)
spawned uWSGI worker 8 (pid: 9301, cores: 1)
spawned uWSGI worker 9 (pid: 9302, cores: 1)
spawned uWSGI worker 10 (pid: 9303, cores: 1)

nginx interface is

I SEE IT!!!!!!!!!!!!!!! WARNING!!!!!!!!!!!!!!
no request plugin is loaded, you will not be able to manage requests.
you may need to install the package for your language of choice, or simply load it with --plugin.

So I added --plugin python3, and the result was

Traceback (most recent call last):
File "./backend/wsgi.py", line 12, in <module>

from django.core.wsgi import get_wsgi_application

ImportError: No module named 'django'
unable to load app 0 (mountpoint='') (callable not found or import error)
no app loaded. going in full dynamic mode
uWSGI is running in multiple interpreter mode

nginx interface becomes

nginx refreshes, uswgi responds.

what to do? Ask God for help. . .