The study was carried out in Al-Assad University Hospital in Lattakia in surgery department for a period of two years (2014 – 2016). There were 52 patients with 104 undescended testises , their ages were between (6 months -5 years) .The objects of this study were as following: 1- study the result of treatment of B-HCG for bilateral cryptorchidism. 2- Study the optimal age for the application of hormonal treatment with B HCG . Ultrasound (US) was done to 39 patients (75%) to find the abnormalities of urinary tract, and the results were negative. The mean age was 2,5 . There were 29 patients (55.77 %) who were less than 2 years of age. Patients were followed for six months . There was success after six months of treatment 34,61 % of the total sample for bilateral cryptorchidism , 13,64 % of the total sample for one side . if treatment was early , the success rate would be better . the preferred age for treatment of B Hcg is less than 2 years of age .