Hi @ولي, let me see if I can help out here.
Your post has been translated to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
The Z5-series do have a IP65/68-rating, meaning that the phone has been tested to be restistant to certain amounts of water provided that all caps and hatches are intact. For more information on IP-ratings, I would suggest that you check out the link below.
https://support.sonymobile.com/global-en/dm/waterproof/#gref
I hope that helped! Let me know if you have any further questions!
