Research on the posthumous title system in the Wei, Jin, Southern and Northern dynasties Study on the merit system in the Wei, Jin, Southern and Northern Dynasties Research on the burial ritual system in the Southern and Northern Dynasties 并列题名：Study on the merit system in the Wei, Jin, Southern and Northern Dynasties Research on commerce of the Silk Road in the Wei Jin Southern and Northern Dynasties Study on the imitated poems in the Wei, Jin, Northern and Southern dynasties Research on editing thoughts in Wei, Jin and southern and northern dynasties 并列题名：Study on the imitated poems in the Wei, Jin, Northern and Southern dynasties Study on the funeral rites and society of the Wei-Jin, southern and northern dynasties 并列题名：Research on commerce of the Silk Road in the Wei Jin Southern and Northern Dynasties