The present study was carried out during the two successive fall seasons of 2017 and 2018, at private farm in Kafr El-Sheik Governorate, under clay soil condition using furrow irrigation system. These experiments aimed to evaluate the effect of some combinations among four plant densities (20, 30, 40 and 60 plants/m2) with four types of chemical compounds (its symbols i.e., chemical compound 1, 2, 3 and 4) beside the control treatment on growth, yield and pods quality of snap bean (Phaseolus vulgaris L.) cv.Polista as a famous variety, grown under open field conditions. This study aimed to introduce a practical solution to resist atmospheric changes and instability in temperature and especially sudden sharp recursively during growth and fall season. All studied densities gave rise to a positive effect on plant growth expressed as plant height, number of branches per plant, number of leaves per plant, leaf area per plant, foliage fresh weight and foliage dry weight per plant compared with control treatments. Positive impact in comparison with the treatments of the promo, which recorded the highest values of vegetation such as plant height, number of branches per plant and number of leaves / plant when growing 40 plants/m2 and using chemical compound 2, while cultivating 30 plants/m² with chemical compound 1 gave the highest values of fresh and dry weight, Leaf area and the stem diameter. Regarding the influence of interference on the pod weight in the first season only, the length of the pod and the number of pods/plant in both seasons did not show any differences moral consequences, while cultivating 30 plants/m² with chemical compound 2 gave higher values for the pod weight in the second season, the length of the pod and the total yield, if using 30 plants/m² with chemical compound 1 record higher values for the pod thickness. Regarding the chemical content of the leaves as chlorophyll, nitrogen, potassium, recorded the highest values when growing 30 plants/m² with chemical compound 2, except the highest phosphorus values when planting 30 plants/m² with chemical compound 1. Also treatment 30 plants/m2 with chemical compound 1 gave higher values for the content of vitamin C, TSS and less fiber content and acidity and therefore get the high yield plus high quality.