  We installed two sets of Astronomical Site Monitoring System(ASMS) at Lijiang
Observatory(GMG), for the running of the 2.4-meter Lijiang optical
telescope(LJT) and the 1.6-meter Multi-channel Photometric Survey Telescope
(Mephisto). The Mephistro is under construction. ASMS has been running on
robotic mode since 2017. The core instruments: Cloud Sensor, All-Sky Camera and
Autonomous-DIMM that are developed by our group, together with the commercial
Meteorological Station and Sky Quality Meter, are combined into the
astronomical optical site monitoring system. The new Cloud Sensor's Cloud-Clear
Relationship is presented for the first time, which is used to calculate the
All-Sky cloud cover. We designed the Autonomous-DIMM located on a tower, with
the same height as LJT. The seeing data have been observed for a full year.
ASMS's data for the year 2019 are also analysed in detail, which are valuable
to observers.
