解决方案：

1. @H_404_16@ First,we need to drop template1. Templates can’t be dropped,so we first modify it so t’s an ordinary database:

   UPDATE pg_database SET datistemplate = FALSE WHERE datname = 'template1';

2. @H_404_16@ Now we can drop it:

   DROP DATABASE template1;

3. @H_404_16@ Now its time to create database from template0,with a new default encoding:

   CREATE DATABASE template1 WITH TEMPLATE = template0 ENCODING = 'UNICODE';

4. @H_404_16@ Now modify template1 so it’s actually a template:

   UPDATE pg_database SET datistemplate = TRUE WHERE datname = 'template1';

5. @H_404_16@ Now switch to template1 and VACUUM FREEZE the template:

   VACUUM FREEZE;