Research objective: The research aims at developing through a training program: The level of offensive skill performance for basketball juniors 3×3. The level of offensive tactical thinking for basketball juniors 3×3. Research Methodology             The researcher used the experimental method to suit the nature of this research by using the experimental design of pre and post measurement for one group. Research community The research community represents basketball youth under 16 years old, who are registered in the Giza area of the Egyptian Basketball Federation for the season 2020/2021. Research Sample: The research sample was randomly selected from the basketball junior at Tarsana Sports Club under 16 years for the sports season2020/2021, and the total number of the research sample was (31) youngsters. Conclusions The training program has a great role in developing the skill level of basketball juniors under 16 years 3×3, as the value of "T" calculated in the dribbling test ranged from (18.6), in the pass test (91.1), in the test of lay-up shooting correction (13.8), and in Jumping Aunt Test (21.1). The percentage of improvement in the level of offensive skill performance of the research sample ranged between (14%: 116%), which indicates the effective role of the training program. The tactical training program has a positive effect on the tactical thinking of basketball juniors under 16 years 3×3, as the calculated value of "T" reached (60.66). The rate of improvement in tactical thinking was (46.73%) among basketball juniors under 16 years 3×3, which contributes positively to effectively ending the attack.