Yi Ding, named Wu Hanjie, a national first-class artist, was born in Maoming, Guangdong Province. He loved calligraphy and painting since his childhood. He began to teach from Guangzhou Academy of Fine Arts in 1990. His works have been held on the 115th anniversary of Ye Jianying's birth, the Hong Kong International Calligraphers and Painters Association Calligraphy and Painting Exhibition, the Guangdong Calligraphers and Painters Association Works Exhibition, and the Guangdong Callig Exhibition, Guangdong Hengxin painting academy exhibition and other activities.

In October 2013 and December 2014 in Guangzhou held a personal exhibition, January 2016 in Maoming Museum held a personal exhibition, December 2016 in Guangdong Hengxin Academy of Calligraphy and Painting held a personal exhibition. His works have their own characteristics and are loved by the fans of paintings and calligraphy, and are often published in various publications. In 2005, his works of "Bamboo Paper Peace" and "Red Cotton" were accompanied by Chinese peacekeeping police riot squad in Haiti to participate in international friendly exchanges in the United Nations mission area in Haiti. In 2012, his works won the gold medal in the "Welcome the 18th National Day. Guangdong Calligraphy and Painting Art Research Exhibition". In 2013, his Chinese painting "Pomegranate Red" was selected as "2013" The exhibition of Guangdong calligraphy and painting art exhibition won the silver award. In January and April 2016, his flower-and-bird freehand brushwork "Beautiful Called Butterfly Dance" and "Mei Lan Zhu Ju" won the silver medal in the "Bingshen Chinese Calligraphy and Painting Annual Exhibition" jointly organized by the Chinese Art Association, the Chinese Calligraphy Association and the Chinese Encyclopedia of Calligraphy and Painting. The Bingshen Annual Chinese Painting and Calligraphy Exhibition jointly organized by the Chinese Calligraphy Association and the Chinese Encyclopedia of Calligraphy and Painting won the gold medal. In November 2016, he won the gold medal in the National Poetry, Poetry, Calligraphy and Photography Competition to commemorate the 80th anniversary of the Long March of the Red Army.

He is currently a member of Maoming Artists Association of Guangdong Province, a special painter of Maoming Calligraphy and Painting Academy and Bayi Calligraphy and Painting Academy, a vice-chairman of Guangdong Calligraphy and Painting Association, a vice-chairman of Guangdong Calligraphy and Painting Research Association, a vice-chairman of Guangdong Hengxin Calligraphy and Painting Academy, a director of China Arts Association, and a vice-chairman of China Flower and Bird Painting Association.

一丁，名字吴汉杰，国家一级美术师，出生于广东茂名, 自幼酷爱书画，从1990年开始师从广州美术学院姜今教授，其作品曾在叶剑英诞辰115周年、香港国际书画家协会书画展、广东书画艺术研究会作品展、广东省书画家协会书画展、广东恒鑫书画院画展等活动中展出。
2013年10月和2014年12月曾在广州市举行个人画展，2016年1月在茂名市博物馆举行个人画展，2016年12月在广东恒鑫书画院举行个人画展。其作品自成特点，深得书画爱好者的喜爱并常在多种刊物刊登。2005年其《竹报平安》和《红棉》作品曾随中国赴海地维和警察防暴队到联合国海地任务区参加国际友好交流，2012年其作品在“喜迎十八大.庆国庆广东书画艺术研究会作品展”中荣获金奖，2013年其国画作品《石榴红》入选“2013广东书画艺术研究会作品展”并荣获银奖。2016年1月和4月，其花鸟写意作品《艳丽招来蝴蝶舞》《梅兰竹菊》在中国美术协会、中国书法协会和中国书画大百科联合举办的“丙申年中华书画年展”荣获银奖；2016年3月其泼墨山水作品《不歇玉泉乐青山》在中国美术协会、中国书法协会和中国书画大百科联合举办的“丙申年中华书画年展”荣获金奖。2016年11月其写意花鸟画《历尽沧桑 贵在有根》及泼墨山水画《气壮山河》在“纪念红军长征八十周年全国诗词书画摄影作品大赛”荣获金奖。
现任广东省茂名市美术家协会会员、茂名市书画院及八一书画院特聘画家、广东省书画家协会副主席、广东书画研究会副会长、广东恒鑫书画院副院长、中国美术协会理事、中国花鸟画协会副主席。