The present investigation was conducted at Agronomy Research Farm at ANDUA&T, Kumarganj, Ayodhya (U.P.) during Zaid season of 2021 to asses the planting geometry with phosphorus levels on growth and yield of summer moong. The twelve treatments were tested in Factorial Randomized Block Design with three replications keeping three planting geometries viz.,30 cm x 10 cm, 30 cm x 15 cm, 30 cm x 20 cm and four phosphorus levels viz., 0, 20, 40 and 60 kg/ha. The soil of field was silty loam and the pH of soil was 8.3. The summer moong variety of NDM-1 was sown on 16-04-2021 with seed rate of 20 kg/ha. and the crop was harvested on 25-07-2021. Results revealed that the growth attributes viz., plant population, plant height, dry matter accumulation, branches per plant and leaf area index were significantly higher at 30 cm x 15 cm planting geometry over rest geometry, respectively in summer moong. The yield attributes as number of pods per plant, length of pods, number of grains per pod and number of grains per plant were significantly superior in summer moong crop at 30 cm x 15 cm planting geometry compared to 30 cm x 10 cm and 30 cm x 20 cm planting geometry, respectively. The planting geometry of 30 cm x 15 cm were proved significantly superior in terms of seed, straw and biological yield and harvest index when compared to the rest of treatments, respectively. The increment percentage in seed yield of 10.15% and 6.34% compared to 30 cm x 10 cm and 30 cm x 20 cm planting geometry, respectively. The plant height, dry matter accumulation, branches per plant and leaf area index were found significantly superior upto 40 kg/ha, phosphorus over rest planting geometries, respectively except number of branches per plant upto 60 kg P2O5 /ha. The number of pods/plant, length of pods, grains/pod and grains per plant were significantly increased upto 40 kg P2O5 /ha over rest used phosphorus doses, respectively. The highest seed yield, straw yield biological yield and harvest index were recorded significant upto 40 kg/ha phosphorus over 0, 20 and 60 kg/ha P2O5, respectively and increased phosphorus levels at 60 kg/ha at par in respect harvest index only. The increment evaluated in grain yield of summer moong (37.16% and 20.72%) over control and 20 kg/ha phosphorus, respectively. Therefore, the planting geometry of 30 cm x 15 cm with used 40 kg/ha phosphorus were better performance in terms of growth and yield attributes and yields of summer moong in present field experimentation.