Venue: Also known as Dojo. A square with a side length of 14- 16m, usually green, is placed on an elastic floor or platform. The platform is made of solid and elastic wood, with a side length of about 18m and a height of 0.5m The playing field is divided into two areas, the inside and the outside, separated by a red danger zone with a width of about1m.. The area within the danger zone (including the danger zone) is called the "competition zone" with a side length of 8- 10m. The area outside the danger zone is called "safety zone", and its width is about 3 meters (not less than 2.5 meters). . In the center of the competition area, there are red and white signs with a length of 25cm/50cm and a width of 6cm/ 10cm respectively, and the two lines are 4m apart.

Competition venue and clothing: Judo competition venue is paved with tatami or suitable materials similar to tatami, and the color is usually green. There is a competition area and a safety area. One athlete wears a blue judo suit and the other wears a white judo suit. The length of the jacket of judo suit should cover the thigh, and the left lapel of the jacket should be wide enough to hold down the right lapel. The waist is tied with a belt with a width of 4 to 5 cm, and its color represents the position of the athletes. Competition rules: During the competition, according to the skills used by athletes and their quality and effect, four kinds of scores are awarded: 1. One copy: get one copy in four cases: one side of the competition controls the other side, and puts the other side into most of the ground with considerable strength and speed; When one side controls the other side in the "pressure technique" competition so that it can't get out of control within 25 seconds after announcing the "pressure technique start"; When one side slaps the mat or the other side's body with hands or feet for more than two times, or shouts "lost"; When one side of the competition uses torsion technique or joint technique to fully display the technical effect. In addition, when one side of the competition is punished by the fourth "guidance", the other side gets "one book" score. When one party gets a copy, it wins the game. 2. Skills: There are two situations to obtain "skills": when one side of the competition controls the opponent and falls down with throwing skills, but the technical effect is insufficient to judge "a book"; In "pressure technique", one side of the game controls the other side for more than 20 seconds. In addition, when one side of the competition is punished by the third "guidance", the other side gets a "skill" score. When one side of a competition gains a second "skill" in a competition, that side wins. 3. Effective: There are two situations to be "effective": when one side of the competition controls the opponent and falls down with throwing technique, but the technical effect is not enough to judge "a book"; In "pressure technique", one side controls the other side for more than 15 seconds. In addition, when one side of the competition is punished by the second "guidance", the other side gets an "effective" score. In a game, after an athlete gets a copy, the game can end, and the athlete who gets the copy wins the game. If there is no "book" victory in a competition, the winner will be judged according to the number of "skills" and "effectiveness" within the specified competition time. But one "proficiency" is better than all "effectiveness". If the scores of both sides are equal, overtime will be played, and the first scorer in overtime will win. After the overtime, if the scores of both sides have not changed, the lighter side will win, or the winner will be decided by three referees after consultation. judo

Foul: If an athlete fouls or exceeds the competition area, depending on the seriousness of the case, he/she will be given the punishment of "guidance" (no penalty), "attention" (loss of one foreign currency), "warning" (deduction of half a point) and "disqualification" (one foul). When an athlete is warned twice in a competition, he is disqualified and the other side wins. The most serious foul is a foul, but before the penalty, the referee needs to negotiate with the linesman. Don't hit each other, don't hit each other with your head, elbows and knees, and don't scratch each other's hair and lower body. Never hit your opponent in the face with your hands, feet, legs or arms. Don't do anti-joint exercises on other joints except elbow joint. It is forbidden to do anything that may hurt the other person's cervical vertebra or spine. In addition, excessive defense in the game, being pushed out of the competition area by the opponent or deliberately avoiding the opponent, causing danger to the opponent, are all fouls. Beyond the competition area means that any part of the judo player's body is beyond the competition area. If one side throws at the other side and falls off the court because of losing its center of gravity, it is judged whether it is a foul according to the landing time of the fallen player: if the fallen player lands first, it is not a foul, otherwise it is a foul. It is not a foul to be thrown off the court by an opponent in a game with regular movements. Don't grab your opponent below the waist, or you will be sent off immediately. It is forbidden to hit in judo, and it is forbidden to use the head, elbow and knee to contradict each other. Don't do anti-joint exercises on other joints except elbow joint. Don't scratch your hair and genitals. It is forbidden to do anything that may hurt the other person's cervical vertebra or spine. Athletes who violate the rules or step out of the competition area will be given "guidance", "attention", "warning" and "disqualification" depending on the seriousness of the case. When an athlete is warned twice in a competition, he is disqualified and the other side wins.