Abstract: The normal dynamic characteristic of gas radon in Liaogu First Well is analyzed.The results show that the dynamic characteristic of years of gas radon is to decline slowly, annual state is higher in winter and lower in summer, monthly and daily state are undulate, but they all vary in a fixed range.Through analysis to the dispersion of gas-radon data we found that the apparatus of degasification influence the value of gas radon greatly.Daily meansquare deviation and daily variation magnitude can all reflect the scattered level well and confirm each other.