jazakallah for answering my question on Dharul Islam and Dharul Kufr.
there is another problem. some muftis say that our country is neither Dharul Islam nor Dharul Kufr ,but Dharul Amaan. I want to know what is Dharul Amaan and under what category it falls.
What can Muslims do in Dharul Amaan.

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.

The lands of Allaah are of two types: Muslim land (Daarul Islam) and non-Muslim land (Daarul Kufr). In the latter, either there are some reason for fighting between Muslims and non-Muslims, in which case it is called land of war (Daarul Harb), or that there are some reasons for peace, like reconciliation and covenant between Muslims and non-Muslims, in which case it is called land of peace (Daarul Amaan). Therefore, it becomes clear that Daarul Amaan (land of peace) is in reality land of non-Muslims and it is not a separate third category.

As regards what a Muslim can do in Daarul Amaan (land of peace), then he should respect the laws of that country, that organizes life and does not contradict the Sharee’ah rulings.

Moreover, he should be a good example and he should reflect on the people of that country the good traits of Islam through his dealing with them (in a good manner).

However, if a Muslim fears affliction in his religion, he is obliged to migrate to a Muslim country where he would feel safe. For more benefit on the rulings of migration, please refer to Fatwa 86405.

Allaah Knows best.