Studies are made of the seasonal and periodical variations of angular momentum transport by quasi-steady eddies at 100rob based on computations, using monthly mean height data, of its values in January, April, July and October as a function of wave numbers(from i through 10) at latitudes (from 25°N through 75°N) for 83 months during the period of 1956-1976.The results show that almost the total transport is accomplished by the ultra-long waves of numbers 1-a at 100rob. Different wave numbers exhibit considerable individuality in the transport for different seasons and latitudes.It is found by power spectral analysis that the variations with periods of 13-14, 28-29 or 57 months prevail at lower latitudes (south of 35°N).It is noted that the quasi-biennial oscillation is likely to be related to the interaction between the transports by wavenumbers 1 and 3.