Abstract: From September 1987 to August 1989，the authors had reared Malayan Sun Bears，2 male adults and7 scubadults(3♂．4♀♀) which were from Ruili，west of Yunnan Province，studied the composition of diet which could meet the need of growth and development bears at different ages and observed the change of morphology，the growth of body weight，daily active time，and the formation of social structure in subadult group．The main results are as follows：
1．The composition cf diet is changed with different ages (Table 1 ). Subadults can grew and develop well. They can become sex-maturity at 2 or 3 years old.
2．The eyes of new born infants are closed Infants generally open their eyes at 25 days old．but they have no eyesight until 50 days old.
3．The newborn infants have no hearing, Before 30 days old the hearing is poor．After 50 days old，the hearing becomes sharper and sharper.
4．At 40 days old，the upper incisors and canine tooth start to appear，the complete adult dentition is acquired at about 18 months.
5 At 30 days old，the body hair of infants is greyish black except a dirty white U-shape mark in the breast and brown white or milk white muzzle．After 30 days old，infants begin to change hair. At 58 days old，the hair becomes very black and bright．
6． The body weight growth equations of subadults are：
♂: W =0.3414t ^1.1282，♀: W =0.3424t ^1.0918．
At 2 years old，the subadults reach the adult body weight. When the body weights are as the percentage of adult 1eve1，the growth equations are：
♂:W =0．7781t ^1.1275, ♀:w=0．9063t ^1.0921．
7. In captivity，te daily active peaks are in the morning and evening．which is different from thoes in the field；at summer，the bears like to swim in the pool. to chase and sleep in the shade；at winter，they like to take sunbathl during the peiod of growth, the active peak of subadults is at one year old at ocstrus．the daily active time is 8-10 hours．
8 After one year old，the group of subadult starts to form a constant social structure． which is for males．

Key words: malayan sun bear (Helarctos malayanas), Artificial rearing, Growth and development, Behavior

摘要： 1987年9月至1989年8月，笔者对来自云南瑞丽的2只雄性马来熊成体和7只幼体(3♂．4♀♀)在人工饲养条件下进行了观察研究，本文报道在不同生长时期的不同饲料配方，幼熊感觉器官的发育，齿式的形成，外部形态的变化、体重的生长方法及行为。

关键词: 马来熊, 人工饲养, 生长发育, 行为