The power train of hydro-mechanical continuously variable transmission for forklift makes use of hydro-static unit, hydraulic multi-wet disc brake & clutches and complex helical & planetary gears. The complex helical & planetary gears are very important parts of the transmission for forklift because of a strength problem. In the present study, calculating specifications of the complex helical & planetary gear train and analyzing the gear bending and compressive stresses of the gears. It is necessary to analyze gear bending and compressive stresses confidently for optimal design of the complex helical & planetary gears in respect of cost and reliability. In the paper, analyze actual gear bending and compressive stresses of complex helical & planetary gears using Lewes & Hertz equation, also verify the calculated specifications of the complex helical & planetary gears by evaluating the results with the data of allowable bending and compressive stress from the Stress - No. of cycles curves of gears. In addition, in this paper also analyze actual gear scoring and evaluate the possibility of scoring failure of complex helical & planetary gear train of hydro-mechanical continuously variable transmission for forklift.