方法1：

SELECTION-SCREEN BEGIN OF BLOCK blc WITH FRAME TITLE  text-001.
SELECT-OPTIONS: p_zhgrq FOR ztpp012-zhgrq .
SELECTION-SCREEN END OF BLOCK blc.

INITIALIZATION.
  p_zhgrq-sign = 'I'.
  p_zhgrq-option = 'BT'.
  p_zhgrq-low = sy-datum.
  p_zhgrq-low+6(2) = '01'.
  p_zhgrq-high = sy-datum.
  append p_zhgrq.

方法2：

REPORT demo_sel_screen_select_default.
DATA wa_spfli TYPE spfli.
SELECT-OPTIONS airline FOR wa_spfli-carrid
               DEFAULT 'AA'
                    TO 'LH'
                OPTION  nb
                  SIGN  i.