Abstract: Bring productive potentiality intofull play of upland rice variety“QinAi”seeding on unfallowing field of wheatin Beijing and Tianjing area.The diff-erent seeding time experiment of “QinAi”and“Ji Geng No. 7”was goneon.As result to variant grain weightwith seeding time because there are di-fferent light and temperature in diffe-rent seeding time,since the optimumseeding time is earlier 10-20 days thanthe seeding time of unfallowing fieldof wheat.We suggested that the“QinAi”are seeded on unfallowing field ofearly maturity wheat.

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