LAMOST is a unique telescope, its optical axis is on the meridian plane with a 25 degree inclination to the horizontal, the optical path is 60 meters, much longer than that of traditional telescope, that causes much more serious dome seeing problems.
To improve the seeing around telescope, studies are carrying out on the enclosure thermal performance design, that include ventilation, air conditioning, cooling for heat sources, and calculation of thermal parameter of enclosure structure. Some experiments are taking for the remove the main heat from electronic.
This paper will concentrate on dome seeing improvement, related studies and experiments. The data obtained from calculation and experiments will be used for enclosure design to improve LAMOST dome seeing.