Purpose: The purpose of this research is to verify the effects of developed rational cognition restructuring program for tennis players and to implicate sports field derived cognition restructuring program. Methods: Delphi method to reanalyze 127 questionnaire according to tennis specifications, and 28 questionnaire were removed and 13 questionnaire were added. Group of specialists, conducted binary inductive analysis for categorization based on REBT. Finally, in order to implicate the cognition restructuring program, 12 period consultations were conducted using REBT counselling method as a part of program implication method. To verify the developed rational cognition reconstruction program, psychological examination was conducted before and after the program use through sports psychological examination, TOPS, CSAI-2. To verify the effects of rational cognition reconstruction program, player’s mental state changes were quantified. Results: Average sports psychological skills increased from 3.16 to 3.61, showing 0.55 points, average performance strategy was increased from 3.10 to 3.37, showing 0.65 point increase, and sports competition anxiety was reduced from average 2.21 to 2.10, showing –0.10 point decrease. Lastly, According to qualitative analysis on the consultation, the irrational principles aroused by the player’s mental problems shifted to rational cognition and resulted as heightened focus and confidence in the game. Conclusion: The irrational principles aroused by the player’s mental problems shifted to rational cognition and resulted as heightened focus and confidence in the game. Rational cognition formed positive attitude on players.