Multi-Object Fiber Spectroscopic sky surveys are now booming, such as LAMOST already built by
China, BIGBOSS project put forward by the U.S. Lawrence Berkeley National Lab and GTC (Gran Telescopio
Canarias) telescope developed by the United States, Mexico and Spain. They all use or will use this approach and
each fiber can be moved within a certain area for one astrology target, so observation planning is particularly
important for this Sky Surveys. One observation planning algorithm used in multi-objective astronomical observations is
developed. It can avoid the collision and interference between the fiber positioning units in the focal plane during
the observation in one field of view, and the interested objects can be ovserved in a limited round with the maximize
efficiency. Also, the observation simulation can be made for wide field of view through multi-FOV observation. After the
observation planning is built ,the simulation is made in COSMOS field using GTC telescope. Interested galaxies, stars
and high-redshift LBG galaxies are selected after the removal of the mask area, which may be bright stars. Then 9 FOV
simulation is completed and observation efficiency and fiber utilization ratio for every round are given.
Otherwise,allocating a certain number of fibers for background sky, giving different weights for different objects and
how to move the FOV to improve the overall observation efficiency are discussed.