Soil water and nitrogen interactive absorption plays an important role in maintaining maize and potatoyield.Potexperiment with drip irrigation was conducted in thisstudy，dynamic apparent water consumption ofmaize( Zea mays)andpotato( Solanum tuberosum)in different growth stages under the conditions of intercropping was quantitatively monitored.Frome the changes of apparent water consumption and nitrogen content in crops through the growthstages，the relationshipbetween water uptake and nitrogen accumulation in plants were analyzed.Results showed that，maize intercroppingpotato had obvious yieldadvantage，the land equivalent ratio(LER)was 1.36，interspecific competition of maize wasstronger than potato.In the whole growth period，compared with that of monocropping，intercropping maize apparentwater consumption was 16.67%lower，total nitrogen uptake was 96.30%lower，intercropping potato apparent consumptionwas 15.44% higher，and total nitrogen uptake was 83.66%lower.There was a significant positive correlation of maizebetween the apparent water consumption and nitrogen accumulation in the whole growthperiod，the correlation coefficient ofintercropping(0.769)was higher than that ofmonoculture(0.701)，and increased with the growthperiod，the correlationcoefficient of maize reached the maximum at heading stage to maturitystage(intercropping maize was0.814，monocroppingmaize was0.717)；the apparent water consumption was significantly correlated with the amount of nitrogen accumulation ofpotato during the formation stage until the starch accumulationstage，and the correlation coefficient ofintercropping(0.875)was higher than that of monoculture(0.808).In short，water consumption and nitrogen absorption coefficient of maizeand potato intercropping system was higher than monoculture，and the characteristic was more obvious with the growth ofcrop.In conclusion，maize and potato intercropping promoted the synergistic absorption of water and nitrogen，which was more obvious with the growth period.