A field experiment was carried out during winter (rabi) season of 2008-09 and 2009-10 at Agriculture Research Station, Banswara to find out agronomic productivity and advantages of intercropping frenchbean, onion and garlic planted with winter maize (Zea maize L.) at three planting patterns (1:1/2, 2:2/4 and 3:4/8 row ratio) for Humid Zone of Southern Rajasthan. The efficiency of intercropping system was evaluated using Maize equivalent yield (MEY) and Land equivalent ratio (LER) having higher values of these indicators calculated in intercropping systems which ultimately brought out advantage in yield, land use efficiency and monetary return/unit time over their respective monoculture checks. All intercropping models studied in any ratio calculated significantly higher maize-equivalent yield compared with sole maize. The grain yield of maize under intercropping system compared with sole maize yield (56.54q/ha) however, was marginally reduced. Among the intercrops, onion proved more advantageous compared with other intercrops. Onion intercropped with maize in 2: 4 row ratio (50/110cm) proved to be the most efficient and economically viable intercropping system which calculated the highest maize-equivalent yield (89.38q/ha), land equivalent ratio (1.34), relative crowding coefficient (11.56), system productivity index (75.62), net return (Rs 49366/ha) with maximum benefit: cost ratio of 2.23 closely followed by onion intercropping with maize at 3:8 row ratio. Thus, intercropping of onion with maize either at 2:4 or 3:8 row ratio maintained at 50/110cm or 50/170cm was more feasible and profitable intercropping option for winter maize in humid Southern Rajasthan.