The fllowing view stores the information I want.And share with you!
FND_FLEX_VALUE_CHILDREN_V
SQL> desc FND_FLEX_VALUE_CHILDREN_V;
Name Type Nullable Default Comments
----------------- ------------- -------- ------- --------
FLEX_VALUE_SET_ID NUMBER(10)
PARENT_FLEX_VALUE VARCHAR2(60)
FLEX_VALUE VARCHAR2(150)
DESCRIPTION VARCHAR2(240) Y
SUMMARY_FLAG VARCHAR2(1)