In this article, we present a detailed analysis of the statistical properties of seeing for the Muztagh-ata site which is a candidate site for hosting the future Chinese Large Optical/infrared Telescope (LOT) project. The measurements were obtained with differential image motion monitors (DIMMs) from April 2017 to November 2018 at different heights during different periods. The median seeings at 11m and 6m are very close but significantly different from that on the ground. We mainly analyzed the seeing at 11m monthly and hourly, having found that the best season for observing was from late autumn to early winter and seeing tended to improve during the night only in autumn. The analysis of the dependence on temperature inversion, wind speed and direction also was made and the best meteorological conditions for seeing are given.