@Jackan hello,
Here is an example for IPSec VPN between Juniper SRX220 and Huawei USG firewall,
https://forum.huawei.com/enterprise/en/ipsec-vpn-establishment-between-juniper-firewall-huawei-firewall/thread/560043-867for the Juniper configuration, you can refer to the example.
for the Huawei USG firewall configuration, I translates it to the AR configuration, please check below,
tips: Please modify the parameters beased on you own network.
ike proposal 10
encryption-algorithm aes-256
dh group14
prf sha2-256
integrity-algorithm hmac-sha2-384
sa duration 86400
ipsec proposal 10
encapsulation-mode tunnel
esp encryption-algorithm aes-256
esp authentication-algorithm sha2-256
ike peer 10 v1
pre-shared-key cipher YOUR_PASSWORD
local-address 10.10.10.47
remote-address 10.10.10.254
local-id-type ip
exchange-mode main
acl 2001
rule 5 permit source 192.168.1.0 0.0.0.255
ipsec policy 10 10 isakmp
ike-peer 10
proposal 10
security acl 2001