Abstract: The latest version of a global numerical model with zonal domain, p-sigma vertical coordinate and primitive equations is used to simulate the stationary waves and diabatic heating fields in the mid-and-low latitudes in July. The results show that the model successfully simulated the stationary waves with wave number 2 in the mid troposphere in northern summer with the wave peaks and troughs in the upper level appearing over the continents and the oceans, respectively. The case is just reversed in the lower level. The subtropical high belt in the Southern Hemisphere and the rainfall amount, especially that due to convection within the ITCZ, are also well simulated. The simulated heating fields reveal that the main heating sources are located over the continents of the Northern Hemisphere and the ITCZ belt in the tropical oceans and sinks are over the vast areas of the oceans. The heat sources over the oceans come from the condensation at the upper levels, while some of the heat sources over land areas are induced by the sensible heating in the lower layers of the atmosphere and some of them are mainly resulted from latent heating. The sinks over the oceans are induced by long wave radiative cooling.