Experiments were carried out to ascertain the effects of growth regulators spray (RP-7846: 100 ppm, 200 ppm, 300 ppm and Trylone-tomato : 50 ppm, 100 ppm, 150 ppm) on the growth of tomato, in 1967 at the Agricultural Faculty, Shinshu University. The determinate variety H-1370 was used. The results obtained are as follows; 1. The number of fruits and total weight in growth regulators spray lots were much than those in control. 2. The number of seeds in fruits sprayed growth regulators were as much as control, although seed content per fruit varied among harvest days. 3. RP-7846 as whole plant spray was most effective in this experiment.