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Supplementary irrigation needs of cucumber and tomato were determined for on-site rainwater harvesting in semi-arid regions of loess plateau, where precipitation exceeds 250mm. Runoff efficiency was determined for a heliogreenhouse with 422 m(2) of plastic cover, 120 m(2) of tile-covered back roofing and 560 m(2) of plastic mulch wastes covering the intermediate space. Estimates were 85.4%, 50% and 45.4% respectively, giving 170 m(3) of harvested water. The optimal drip irrigation requirements of cucumber and tomato over the autumn and winter period were 90.5 and 60.8 m(3), respectively, for a heliogreenhouse with a net usable area of 425 m(2).