This study was carried out to evaluate the response of some vegetable crops such as sweet potato and pepper for mechanical transplanting , to improve the field performance of the hand feed vegetable transplanter in terms of field capacity, field efficiency, transplanting accuracy, that concluded, longitudinal and transverse scattering, seedling depth, number of seedling in meter square, energy requirements, criterion cost and determine the optimum parameters affecting the performance of the modified transplanter that influenced by forward speed, seedling distance in row, and slope angle of feeding tube with vertical. The developed attained by adding two limit switches, Sound source and feeding tube to transplanting machine. when the seedling passes into the guide plate and root seedling presses, it then attached with normal open which lead to the cycle open and don't give any sound, but when the pocket passes into the guide plate without seedling, it is stay normal connected and give sound for labor to put seedling in the tube to compensate the missed hill. The experimental field work executed at the farms of El.Baramon Horticultural Research Station, Dakahlia Governorate Egypt, during the seasons of 2004 and 2005. The results of this study could be revealed that, the uses of the developed transplanter manufactured considered a new technology especially under Egyptian conditions and because fulfill a good results with mentioned measurements. Forward speed 1.5 km/h, seedling distance 18 and 31 cm and angle of feeding tube zero degree is recommended for transplanting sweet potato and pepper crop respectively.