This paper shows cloud pictures taken from satellites and aircrafts, trying to link the appearance of the clouds with the three dimensional structure, motion and physical processes that possible exist in the atmosphere by radiative-convective equilibrium theory. In undisturbed atmosphere prevailing horizontal motion， stratus clouds are more or less few and scattered. They spread separately in different layers drifting with the prevailing winds of the layers. On the other hand， deep convection clouds roll in which air flow in different layers are twisted and linked. Although convections happen only in relative small area，they must exist and take important actions in energy balance in the troposphere. The upward energy transportation by convective clouds compensates the heat release by the long wave radiation in the troposphere，and maintains the energy balance in the troposphere.