Carbonate rocks were distributed widely during Middle to Late Devonian in South Hunan Province. Carbonate platform margins can be divided into four types:1. Carbonate ramp; 2. Distally steepened ramp; 3. Accretionary rimmed platform margin; 4. Gully or colluvial margin. Except the influences of sedimentution

eustatism and the migration of basin

the evolution of platform margins or slopes were mainly controlled by synsedimentary fault activities. Since the synsedimentary fault activities in the east and the west sides of the basin unsynchronized

there was distinct differences in the evolution of platform margins or slopes in both sides. The evolution process of the platform margin or slope in west side is considered as:carbonate ramp (D

2

1

q)→accretionary rimmed platform margin (D

2

1

)→gully or colluvial margin (D

3

1

s)→carbonate ramp (D

3

2

s-D

3

1

x); the eastern side is: carbonate ramp (D

2

1

q)→accretionary reefs rimmed margin (D

2

2

q)→distally steepened ramp (D

3

1

s)→accretionary shoals rimmed margin (D

3

2

s)→carbonate ramp (D

3

2

s).