Background:Diaphyseal Humerus fractures treated with multiple Rush nails is a modality of treatment used widely for various advantages. In this present study we have evaluated results for its advantages and lacunae over conservative and open approaches.Methods:Study was conducted in department of Orthopaedics in KPC medical College, Jadavpur, Kolkata. Rush nailing was done in patients with closed displaced shaft humerus fracture with intact proper consent and followed up for period of 6 months for functional mobility.Result:75 patients with diaphyseal Humerus shaft fractures were managed with multiple Rush nails. Out of those, that 44.0% patients had Full recreation, 25.3% patients had Full work and 30.7% patients had Unaffected sleep in Post-op ADL. 13.3% patients had Complication. DASH scores were utilized for ADL. Excellent results were noted in 17.3% (13 cases). In our study the mean Amount of distraction of patients in cm was 2.1133± .7193 in cm and Amount of distraction of patients in degrees was 21.1333± 7.5146.Conclusion:Closed reduction of diaphyseal fractures of humerus is better option than open reduction and plating having advantages of minimal soft tissue dissection and as it is close reduction, the biology of the fracture is also not disturbed and nerve injury are much less and shorter time of surgery and ease of process.