Graphite carbon nitride（ g-C

3

N

4

） is a promising material for dye wastewater treatment by photocatalysis

while the common bulk g-C

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4

has low photodegradation efficiency. The photocatalytic activity of g-C

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4

is affected by specific surface area

crystal structure

absorption capacity of visible light and recombination rate of photoelectron-hole pair.Morphology regulation

metal doping

non-metal doping and semiconductor recombination are introduc

ed. Dyes degradation efficiency of g-C

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N

4

under visible light could be improved by increasing the effective reaction site of photocatalysis

prolonging the lifecycle of photoelectron-hole and improving the response of photocatalyst to visible light. The modification and optimization of g-C

3

N

4

could be realized by synthesizing the single material or with a series of modification processes. In order to develop more efficient g-C

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N

4

photocatalyst with practical application value

researches are suggested to focus more on the practicality of synthesis method of g-C

3

N

4

photocatalyst

the economy of raw materials

the feasibility of photocatalyst recovery and the universality of applicable dyes.