The Hayani cultivar of date palms is the most grown type in North Sinai, Egypt, and is widely sold in markets. However, its fruit quality is not good, and it is facing competition from imported cultivar like Barhi. As a result, it is important to improve the quality of Hayani fruits in order to keep them popular and maintain this local cultivar. In this study, the effects of spraying Hayani date palm fruits with chitosan, arginine, and galangal extract at 100 ppm, 10 mg/l, and 25 mg/l respectively either individually or mixed, on fruit yield and quality were investigated. Results indicated that fruit yield, yield components, and chemical and biochemical characteristics of Hayani dates fruits were improved when spraying arginine at 100 ppm. In general, the spray mixture of arginine at 100 ppm, chitosan at 10 ml/L and galangal extract at 25 ml/L was mostly more effective than the individual application of each of them, as evidenced by the results of all parameters evaluated. This resulted in an increase in bunch weight, fruit weight per bunch, fruit number, flesh net weight, fruit dimensions, fruit volume, total soluble solids (TSS), DPPH scavenging activity, total phenolic content, and total vitamin C. Additionally, fruit color was darker red with this treatment application than the control treatment that shown as pale red color. In contrast, the mixture of arginine with chitosan and galangal extract treatment produced lower tannin content in the fruits.