In the text, the fundamentals of the VLBI observation and the whole process
of data reduction, together with BL Lacertae objects, their properties and Unified
Schemes are synthesized, analysed and reviewed, adding to some comprehension and
opinion of myself. Special discussion and probe are placed on the object AO 0235+164,
as a member of BL Lacertae, whose radio structrue and some special physical proper-
ties, including VLBI observation and data post proce...