From 1987 November to the end of 1994, we monitored these objects and
consecutive photometry at some colour was performed during a few nights for the
objects PKS 0422+004, PKS 0754+101, B2 1156+295, OT 081, PKS 2254+074,
PHL 658 and PKS 2128-123. The CCD attached to the 1-m RCC telescope at the
Yunnan Observatory in China was a RCA 53612 (number 1) before 1993, and
a TeK 512mc (number 2) since 1993, with 320 
and 512
pixels of 
and 
, respectively.
The fields of view of the CCD system are 
for
number 1 located at the Cassegrain focus (f/13.3) of the telescope and
and 
respectively
for number 1 and number 2 which were attached to a focal reducer since 1991.
The comparison star sequences are taken from
Smith et al. (1985) and Miller et al. (1983) for PKS 0754+101 and PKS 0422+004, from
Angione(1971) for
PKS 2128-123, 3C 334 and PHL 658, from Craine et al. (1975) for both
OT 081 and 2254+074 and taken from Smith et al. (1985) for B2 1156+295. The
comparison stars and the objects are in the same frame. The characteristics
of the filters are the same as those of the Kitt Peak National Observatory
(Schild 1983).