The margin of South China in Late Triassic-Middle Jurassic had undergone multi transgression-regression cycles. The element geochemistry character indicates the paleosalinity and the water depth records the relative movements of the sea level. There are three levels of sea level change in the margin of South China. The grade III sea-level fluctuated frequently. The element migration and enrichment which were indicated by Sr/Cu reflected the warm-humid and dry-heat of the climate. The area of Middle Guangdong-East Guangdong in Late Triassic-Early-Middle Jurassic undergone the climate change of warm-humid to dry-heat and to warm-humid.