In this paper, a total of 41 flight detection results during 2009-2011 in Tongliao, Inner Mongolia are statistically analyzed, so as to discuss the microscopic characteristics of various types of clouds in a typical area in the northern China. The results show that average number concentrations of cloud droplets (〖WTBX〗N〖WTBZ〗c) in different types of clouds are: Stratocumulus (Sc) >Cumulus (Cu)>Altostratus (As)>Nimbostratus (Ns)>Altocumulus (Ac), in order of size.〖WTBX〗 N〖WTBZ〗c in precipitable clouds (Ns, As and Sc) generally spanned a large range, and the cumulative probability reduced relatively gentle. Average Liquid Water Contents (LWCs) in precipitable clouds (Sc, Ns and As) were larger than those in nonprecipitable clouds (Ac and Cu). Besides, LWCs〖WTBX〗 〖WTBZ〗in As and Ns were generally between 0.01 and 0.3 g·m-3. The characteristics of average mean diameter (〖WTBX〗D〖WTBZ〗m) for various types of clouds were similar to effective diameter (〖WTBX〗D〖WTBZ〗e), and the cloud types with larger 〖WTBX〗N〖WTBZ〗c have smaller droplet sizes. Average 〖WTBX〗D〖WTBZ〗e ranked: Ns>As>Ac>Cu>Sc. 〖WTBX〗D〖WTBZ〗e and 〖WTBX〗D〖WTBZ〗m of higher clouds (Ac, As and Ns) were generally larger than those in lower clouds (Cu and Sc).〖WTBZ〗 Precipitable clouds compared with nonprecipitable clouds had more big droplets, which is conducive to the formation of precipitation. Moreover, the statistical results show that the relative dispersion of various types of cloud droplet spectrum spread widely when 〖WTBX〗N〖WTBZ〗c was small. With the increasing of 〖WTBX〗N〖WTBZ〗c, the relative dispersion constringed to 0.3 to 0.6, and eventually all kinds of cloud relative dispersion slowly converged to about 0.4 at the high 〖WTBX〗N〖WTBZ〗c.