如果不行的话更改阿里的epel源:wget -P /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/epel-6.repo  
在zabbix服务器端安装开源的字符集
[root@lb01 ~]# yum -y install  wqy-microhei-fonts
[root@lb01 ~]# rpm -ql wqy-microhei-fonts
/etc/fonts/conf.d/65-0-wqy-microhei.conf
/usr/share/doc/wqy-microhei-fonts-0.2.0
/usr/share/doc/wqy-microhei-fonts-0.2.0/LICENSE_Apache2.txt
/usr/share/doc/wqy-microhei-fonts-0.2.0/LICENSE_GPLv3.txt
/usr/share/doc/wqy-microhei-fonts-0.2.0/README.txt
/usr/share/fontconfig/conf.avail/65-0-wqy-microhei.conf
/usr/share/fonts/wqy-microhei
/usr/share/fonts/wqy-microhei/wqy-microhei.ttc
[root@lb01 ~]# 
[root@lb01 ~]# ll   /etc/alternatives/zabbix-web-font    ##zabbix默认的字符集
lrwxrwxrwx 1 root root 38 May 30 17:13 /etc/alternatives/zabbix-web-font -> /usr/share/fonts/dejavu/DejaVuSans.ttf
[root@lb01 ~]#                                                                   #删除默认软连接指向的字符集，指向安装的字符集
[root@lb01 ~]# rm -f /etc/alternatives/zabbix-web-font
[root@lb01 ~]# ln -s /usr/share/fonts/wqy-microhei/wqy-microhei.ttc /etc/alternatives/zabbix-web-font
[root@lb01 ~]# ll   /etc/alternatives/zabbix-web-font 
lrwxrwxrwx 1 root root 46 May 30 22:12 /etc/alternatives/zabbix-web-font -> /usr/share/fonts/wqy-microhei/wqy-microhei.ttc
[root@lb01 ~]# 

不要忘记重启zabbix-server

zabbix 4.2：/usr/share/zabbix/assets/fonts/
zabbix 4.0：/usr/share/zabbix/fonts/
第二种方法
C:\Windows\Fonts  windows字符集考出来一个
 /usr/share/zabbix/fonts   zabbix的字符集
[root@zabbix-server fonts]# ls
graphfont.ttf
[root@zabbix-server fonts]#  
 [root@zabbix-server fonts]# ls
graphfont.ttf  STZHONGS.TTF
[root@zabbix-server fonts]# \mv STZHONGS.TTF   graphfont.ttf
[root@zabbix-server fonts]# systemctl  restart  zabbix-server 
[root@zabbix-server fonts]#