You cannot have statements that create the same temp table more than once even if only one of them will be executed based on conditions. You have to redisign your code so there's only one such statement. Something like

  SELECT * INTO #mytable FROM inserted WHERE 1=2
  IF condition = 'A'
    INSERT INTO #mytable  SELECT * FROM inserted
  ELSE
    INSERT INTO #mytable SELECT * FROM inserted WHERE abc = 'A'

>I have trigger code as below. SQL Server complaint "There is already an object named "#mytable" in the database. But I already restart the server.
>
>

CREATE PROCE myTrigger ON mytable FOR INSERT
>AS
>BEGIN
>  IF condition = 'A'
>    SELECT * INTO #mytable FROM inserted
>  ELSE
>    SELECT * INTO #mytable FROM inserted WHERE abc = 'A'
>END

>
>If I renamed one of them, the error will be gone.
>