本文转自：https://stackoverflow.com/questions/48135889/writing-nvarchar-to-a-text-file

According to the Scripting.FileSystemObject documentation, the CreateTextFile method takes a Boolean value to create a Unicode file. You could change the T-SQL code to use that method instead of OpenTextFile.

EDIT:

Below is an example using OpenTextFile per Tom's comment. I change the iomode value in your original code from 1 to 8 to match the documentation and added the close and destroy in case your full code is missing those important tasks.

DECLARE @OLE INT;
DECLARE @FileId INT;
DECLARE @File VARCHAR(max) = 'c:\test.txt';
DECLARE @Text NVARCHAR(max) = N'من نمایش داده نمیشم';

EXECUTE sp_OACreate 'Scripting.FileSystemObject',@OLE OUT;
EXECUTE sp_OAMethod @OLE, 'OpenTextFile', @FileId OUT, @File,8,1,-1;
EXECUTE sp_OAMethod @FileId, 'WriteLine', Null, @Text;
EXECUTE sp_OAMethod @FileId, 'Close';
EXECUTE sp_OADestroy @FileId OUT;
EXECUTE sp_OADestroy @OLE OUT;